Cal.61

I just purchased a 40's manual wind the third of my Iwc's but do not know it's is a cal.61. The serial number is 1015923. can somebody please verify by the serial number? Regards Cameron

IWC movement #1015923 is indeed a cal 61 10lig. S.C. manufactured in 1940.
They were installed in Ref 304s, in the image below, but probably on other models as well.

The cal. 61 S.C. the wrist watch movement was the first movement built (1938-1942) by IWC with center seconds. The pocket watch movement cal. 61 was a "Glashütte similar" movement allready discussed here). It seems there were some problems with it, it was built only 7800 times and was replaced (1943) with the c.60 S.C. wich is very similar and has the same dimensions compared to the c.61 S.C.

Best regards

Ralph

Thankyou much appreciated

Thankyou Ralph much appreciated