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Watch Case #10 to Fit ETA 6497-1 and 6498-1, Diameter 41mm

Watch Case #10 can be used with or without a dial.
To case the movement use the ETA supplied case screws that came with the movement. Do not screw them in all the way, back them off just enough so that the screw head just touches the case back, when the case back is closed to a waterproof seal.

Please Click Below to see a YouTube Video Interview with Louis Biagi on


"How to Case a Skeleton Movement Without Dial in Case 10"
Click to see Video on Youtube



41 mm Case #10 Domed Mineral Glass Front & Back fits ETA 6497-1 & 6498-1

The Domed Mineral Glass is 37.50 mm in diameter 1.50 mm thick at the sides and thins out to 1.2 mm thick in top center. The bottom is 36 mm flat mineral glass on this 41 mm see-thru back watch case. Comes with a large 7 mm diameter Tap 6 (1.20 mm) waterproof crown that fits the 2.5 mm crown tube on the case. The case is custom made to fit the popular ETA 6497-1 & ETA 6498-1 movements that are 16.5 ligne size (36.6 mm) and 4.5 mm thick. Case does not use a movement ring to hold movement size due to the exact fit of the case to the movement. Simply install the case screws supplied with your movement, backing them off until they just touch the case back after a waterproof seal is made when closing the case tight. See the above YouTube Video on casing this movement.

Dial Diameter needed for this case can be 36.5 mm to 37.2 mm in diameter, the visible dial opening diameter is 36 mm. The case lug size for a watch strap or bracelet is 20 mm. The distance of this 41 mm diameter case from lug holes on one side to the lug holes on the other is 46 mm. Stainless steel case is a screw off back and water-resistant to 3 ATM, replacement case back gaskets 37.50 mm by 0.60 mm are available. This 41 millimeter diameter case body is only 9.5 mm thick, total height from center of domed crystal to back glass is 11.75 mm.


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Price $78.00 $72.00 $66.00 $61.00


Domed Mineral Glass 1.5 Thick by 37.50 mm for Ofrei Case Style #10

1.5 mm thick by 37.50 mm in diameter. Fits 41 mm diameter watch case style #10 for ETA 6497-1 and 6498-1.




Flat Mineral Glass 1.2 Thick by 36.0 mm for Ofrei Case Style #10

1.2 mm thick by 36.00 mm in diameter. Fits 41 mm diameter watch case style #10 for ETA 6497-1 and 6498-1.



I-Form Gaskets Height 0.80 mm Thickness 0.35 mm 367/360
Works with the case back crystal on OFREI-CASE10 and OFREI-CASE11.

Quantity   1 - 2     3+  
Price $2.85 $2.15


Small Second Hands Hole Size 0.27 mm

Unitas and ETA 6497 & 6498 take hole size 0.27 mm.

Watch Case 45 mm Style #7 Sapphire Glass & #8 Mineral Glass to Fit ETA 6497-1 and 6498-1

See Thru "Exhibition Back" Watch Cases in Stainless Steel and Rose Gold PVD Plated

45 mm Diameter Watch Case for ETA 6497-1 and ETA 6497 Watch Movements


Watch Hands 115/200 for Unitas and ETA 6497 & 6498


Dials to Fit Unitas / ETA 6497 & 6498 Movements
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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