Frei & Borel Co.
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Hamilton Watch Mainsprings

   
Genuine Hamilton Steel Mainspring 18 Size 718013
$25.00
HAM-718013 (n/a JA-201)
Genuine Old Stock Hamilton Steel Mainspring 18 Size 718013,
old Hamilton # 15 new number 718013.

width in mm 2.85, strength in mm 0.21, length inches 21-1/4, end T
 


   
Hamilton Mainsprings JA-204
$39.00 $24.95 On Sale!
JA-204
Size 16, Grade 950, 950B, 952. 960 992, 992E, 992B.
Old Hamilton number # 534B new number 718050
Replaces Hamilton Dynavar steel spring old numbers 35433, 35434, 35435 and new numbers 717040, 717041, 717042.

Width in mm 3, strength in mm 0.155, length inches 23-1/2, end D.B.
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95


   
Hamilton Mainsprings 604
$25.00
Replaces Hamilton Dynavar spring for 950-992B old number 35435 new number 717042.

This Newall security brand spring has the extra length 29 inches that these fine models like to have. The measurements are: Width in mm 3, strength in mm 0.165, length inches 29, end D.B. the dennison numbers are 21 x 6 1/4 x 29.
 
Quantity   1 - 2     3 - 11     12+  
Price $25.00 $22.00 $18.90


   
Discontinued Hamilton Mainsprings JA-205 Use JA-206
JA-205
This Size 16 Ham
Grades 956, 964, 965, 968, 969, 975, 975, 976, 977, 978
Old Hamilton steel spring number # 318 new number 718043. The Width in mm 2.85, strength in mm 0.195, is no longer being offered the suggested replacement is to use the 0.19 mm strength JA-206

   
Hamilton Mainsprings JA-206
$39.00 $24.95 On Sale!
JA-206
Size 16
Grades 954, 962, 963, 966, 967, 972, 974, 973.
Hamilton old steel spring number 317 new number 718042

Width in mm 2.85, strength in mm 0.19, length inches 21-1/4, end T
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95


   
Hamilton Mainsprings JA-207
JA-207

DISCONTINUED USE JA-206

 

 

Size 16
Grades 954, 962, 963, 966, 967, 972, 973.
Hamilton old steel spring number 317 new number 718042

Width in mm 2.85, strength in mm 0.18, length inches 21-1/4, end T



   
Hamilton Mainsprings JA-208
$39.00 $24.95 On Sale!
JA-208
Size 16
Grades 960, 961, 970, 971, 990, 991, 992, 993, 994
these grades also used old number 317
Grades 992E, 950, 952 and 996.
Old Hamilton number 534 new number 718047
Width in mm 2.85, strength in mm 0.165, length inches 20-3/4, end D.B.
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95

   
Hamilton Mainsprings JA-209
$39.00 $24.95 On Sale!
JA-209
Size 12, all grades including 912.
Hamilton old steel numbers 1228 & 3028 new old spring number 718071
Would replace new numbers 718070 & 718073 that are no longer made.

Width in mm 1.7, strength in mm 0.18, length inches 21-1/4, end D.B.
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95


   
Hamilton Mainsprings JA-210
$39.00 $24.95 On Sale!
JA-210
Size 10 grades 917, 921, 923, 945.
Old steel spring number 6021 new old spring number 718101
Hamilton Dynavar quality steel spring old number 20434 new number 717102
This is the only strength 10 size Hamilton made in the white alloy line and would replace old numbers 20432, 20434, and new numbers 717100, 717102, 718100, 718102.

Width in mm 1.5, strength in mm 0.17, length inches 17-1/2, end M.B.

$39.00
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Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95


   
Hamilton Mainsprings JA-213
$39.00 $24.95 On Sale!
JA-213
Size 6/0 Grades 986, 988,
Old Hamilton steel spring part numbers 1721 & 1921 the new new is 718200

Width in mm 1.35, strength in mm 0.135, length inches 10, end T
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95


   
Hamilton Mainsprings JA-215
$39.00 $24.95 On Sale!
JA-215
Size 6/0 Grades 986A, 987, 987A 987E, 987F, 987S
Hamilton old part numbers for reg. steel spring 2321 & 2521
New numbers for these same old steel springs are 718201 & 718202
This White Alloy Spring would replace all the Hamilton Dynavar springs old numbers 27432, 27433, 27434, 27435 new numbers 717200, 717201, 717202, 707203

Width in mm 1.4, strength in mm 1.25 length inches 11.5, end T
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95


   
Hamilton Mainsprings JA-217
$39.00 $24.95 On Sale!
JA-217
Size 6/0 Grades 979
Hamilton old part number for reg. steel spring is 2621 and the number was 718203.
This White Alloy Spring would replace all the Hamilton Dynavar springs old numbers 27432, 27433, 27434, 27435 new numbers 717200, 717201, 717202, 707203

Width in mm 1.35, strength in mm 0.115, length inches 11, end T
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95


   
Hamilton Mainsprings JA-218
$39.00 $24.95 On Sale!
JA-218
Size 8/0 grades 730, 735, 747, 748
and 12/0 grades 752,753, 754, 770
Hamilton old # for steel spring 7221, new # 718271
Hamilton Dynavar steel spring old # 44434 new #717273.

Width in mm 1.4, strength in mm 0.095, length inches 13-1/2, end T
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95


   
Hamilton Mainsprings JA-219
$39.00 $24.95 On Sale!
JA-219
Size 8/0 grades 730, 735, 747, 748
and 12/0 grades 752,753, 754, 770
Hamilton old # for steel spring 7221, new # 718271
Hamilton Dynavar steel spring old # 44432 new #717271. Closest to the grade 731 mainspring Dynavar #717270, which is no longer available and had a weaker strength of 0.0815 mm

Width in mm 1.45, strength in mm 0.085, length inches 13-1/2, end T
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95


   
Hamilton Mainsprings JA-220
$39.00 $24.95 On Sale!
JA-220
Size 12/0 Grade 401
Old Hamilton steel spring # 4128 new #718400.

Width in mm 1.18, strength in mm 0.125, length inches 14-1/2, end T
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95


   
Hamilton Mainsprings JA-223
$39.00 $24.95 On Sale!
JA-223
Size 14/0, factory # 5021/718440, width in mm 1.3, strength in mm 0.11, length inches 11.25, end T-BRACE
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95

   
Hamilton Mainsprings JA-226
$39.00 $24.95 On Sale!
JA-226
Size 18/0, factory # 2721/718501, width in mm 1.1, strength in mm 0.09, length inches 11, end T
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95

   
Hamilton Mainsprings JA-229
$39.00 $24.95 On Sale!
JA-229
Size 20/0&21/0, factory # 2921/718531, width in mm 1, strength in mm 0.08, length inches 9, end T-BRACE
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95

   
Hamilton Mainsprings JA-230
$39.00 $24.95 On Sale!
JA-230
Size 20/0&21/0, factory # 36434/717532, width in mm 1, strength in mm 0.09, length inches 9, end T-BRACE
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95

   
Hamilton Mainsprings JA-232
$39.00 $24.95 On Sale!
JA-232
Size 22/0, factory # 6221/718601, width in mm 1.4, strength in mm 0.07, length inches 8, end T-BRACE
 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00
On Sale! $24.95 $21.00 $19.95

   
Genuine Old Stock Steel Hamilton 8/0 size Mainspring #718270
$9.95
HAM-M/S-718270
Genuine Old Stock Steel Hamilton 8/0 size Mainspring #718270

If your interested in using old genuine Hamilton Steel Mainspring we can supply them. The 718270 steel spring is the weakest of the three springs Hamilton used on 8/0 Size grades 730, 731, 735, 747, 748 and 12/0 sizes grades 752,753, 754, 770. Hamilton's really old # for steel spring was 7221, then when Hamilton gave a the parts new #'s it became 718271

HAM-M/S-718270
$9.95

 
Quantity   1 - 2     3 - 11     12+  
Price $39.00 $34.00 $33.00


   

Your cooperation is appreciated.


www.ofrei.com
Otto Frei and Jules Borel, Inc.
Customers Entrance
126 2nd St. Oakland, California 94607
Mailing Address: PO BOX 796, Oakland Ca. 94604
Freight Shipment Address: 119 3rd St. Oakland Ca. 94607 USA


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