Otto Frei.
Quality Jewelry Supplies for Generations - Since 1930
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Mainsprings For Watches - All Types


Regular Mainsprings 0.60 mm to 1.00 mm Widths

Regular Swiss Mainspring All Have Tongue Ends

Regular Mainsprings 1.05 mm to 1.15 mm Widths

Regular Swiss Mainspring All Have Tongue Ends

Regular Mainsprings 1.20 mm Wide

Regular Swiss Mainspring All Have Tongue Ends

Regular Mainsprings 1.25 mm Wide

Regular Swiss Mainspring All Have Tongue Ends

Regular Mainsprings 1.30 mm Wide

Regular Swiss Mainspring All Have Tongue Ends

Regular Mainsprings 1.35 mm to 1.45 mm Widths

Regular Swiss Mainspring All Have Tongue Ends

Regular Mainsprings 1.50 mm to 1.55 mm Wide

Regular Swiss Mainspring All Have Tongue Ends

Regular Mainsprings 1.6 mm to 1.65 mm Widths

Regular Swiss Mainspring All Have Tongue Ends

Regular Mainsprings 1.70 mm to 2.70 mm Widths

Regular Swiss Mainspring All Have Tongue Ends

Automatic Watch Mainsprings


Special End Mainsprings For Longines


Seiko Barrel Complete With Mainspring Caliber 7005A Series

Complete barrel with mainspring for Seiko 7001A, Seiko 7002A, Seiko 7005A, Seiko 7006A, Seiko 7009A, Seiko7019A, Seiko 7025A, Seiko 7S26A, Seiko 7S26C, Seiko 7S36C

Omega Watch Mainsprings


American Watch and Pocket Watch Mainsprings

Mainsprings for American manufactures: Elgin, Hamilton, Hampden, Howard, Illinois, New York Standard, Rockford, Seth Thomas, South Bend and Waltham.

Generic Mainsprings to fit Rolex®


Patek Philippe Mainsprings


Elgin Watch Mainsprings


Genuine Longines Watch Mainsprings


Mainsprings For Vintage Bulova Watches


Genuine Hamilton Mainsprings

Genuine Hamilton Mainspring For Pocket & Bracelet Watches
Some as Low as $8.00 each.


Vintage Blue Steel Watch Mainsprings

Vintage Blue Steel Watch Mainsprings
Five Hundred Eighty Seven Different Mainspring Available.
Some as low as $1.00 each at 3 or more.

IWC Special End Mainsprings


Wittnauer Special End Mainsprings


Zenith Special End Mainsprings


LECOULTRE Mainsprings




End Pieces Used on Mainsprings

Click here to see End Pieces Used on Mainsprings such as Regular Swiss Tongue End, T-Brace, T-End, Hole End, Double Brace, Double Brace and T-End, and much more.
Genuine IWC 853 Automatic Mainspring


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Genuine ETA 2640 Mainspring


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Seiko Caliber 7015 Barrel Complete With Mainspring 0201046

Genuine Seiko Barrel Complete with Mainspring for the very popular Seiko 7015 movement.


Generic ETA 2512-1 Mainspring


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ETA 2892A2 Part # 180 Complete Barrel with Arbor and Mainspring

This is the complete unit ready to be placed in the movement. This barrel is supplied with arbor and mainspring installed. Now you will not have to open the barrel to install new mainspring when you can just replace the complete barrel.

ETA 2892-2, ETA 2894-2, OME 1110, ETA 2893-1, OME 1120, ETA 2895-1, ETA 2893-2, ETA 2893-3, OME 1128, ETA 2892A2, OME 2500, SEL SW300, ETA 2895-2, OME 2500C,


Hole End Mainspring 77-100

Width 2.30 mm, Strength 0.18 Length 18" (457 MM)


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Tongue End Mainspring T240/1

Width 2.40 mm, Strength 0.17 Length 20" (508 MM)


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New Bergeon Mainspring Winder Set For ETA Movements

At last Bergeon has release a set of mainspring winder to use with current ETA calibers in use today. These 12 new winders are made for
ETA 1727-1,
2000-1, 2004-1, 2094,
2660, 2671, 2678, 2688,
2801-2, 2804-2
2824-2, 2834-2, 2836-2
2892A2, 2893-1, 2893-2, 2893-3, 2894-2, 2895-2, 2896, 2897
7750, 7751, 7753, 7754,
7760, 7765
6497-1, 6498-1
6497-2, 6498-2

No longer do you have to make do with what you have or to just go without, when you can now get the right tool for the job.


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Mainspring Winders For Watches & Tools For Mainsprings


Information for the Novice, Hobbyist and others about ordering Watch Parts correctly.

Don't know the ins and outs about needed information for ordering parts read this.

Bestfit #111 Encyclopedia of Watch Material Books Parts 1 & 2

We just found a few copies of the eight edition Bestfit Parts Books Volumes 1 & 2, a total of 835 pages. Order yours today before the limited supply is sold out.

The Bestfit Encyclopedia identifies Swiss, French, German, Italian, and Japanese movements, which were first introduced before 1961-64. This is still the main set of movements and parts identification books used by material houses and watchmakers worldwide today for movements made before 1964. Every serious watchmaker realizes the time and dollars saved with fewer ordering mistakes and parts problems solved with ease. These books will not make you an expert on movements or parts overnight, but will get you headed in the right direction so you can communicate with an expert in no time.

We have been using the Bestfit stock numbering system and books now for well over 70 years. You can order any part shown inside these Bestfit Books using these Bestfit numbers from Otto Frei. If we do not have in stock the item, as a Bestfit Parts Distributors we can order from Bestfit for you. Please, keep in mind that the Bestfit books list several hundreds of thousands of items most of which are no longer in production and a few thousand of the rarest of these parts can be found no where other than in the Bestfit book. However, without these books you have far fewer chances of getting the right parts.

These are the last books that we have. The printing image quality is subpar compared to earlier printings. The text is legible, only some of the images of the movements parts are not as detailed and clear as older printings. These books will no longer be reproduced again and once they are sold out, we are unable to obtain any more.

Regularly: $99.00

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Bergeon Tool for Closing Barrels

Tool allows easy fitting of the barrel cover onto the drum.


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Otto Frei, Watch Parts Since 1930
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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For stock checks on watch parts not listed on the site please call the watch material department at 510-832-0355 ext 3., Monday to Friday 9 AM to 5 PM Pacific Standard Time Zone.
Stock Checks For Watch Movement & Watch Case Parts

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United States
510.832.0355 EXT. 3
800.900.3734 (fax)

510.832.0355 EXT. 3
510.834.6217 (fax)