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3 hours ago, ramos3120 said:

I am trying to source a mainspring for a Unitas 431 445.  It seems to be discontinued 

If you search on Cousin's "Download Documents" for "GR mainsprings" you can down load the whole GR database.

Here's the part you need for Unitas (pages 182-187)

Look for the closest spring they have. Try to match the thickness first (0.21), then width (1.90). The length isn't as important. A shorter spring will just give less running time.


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Emmywatch also seems to be a decent source. It lists 3 different mainspring dimensions with 2 different GR numbers for the Unitas 431. Also a parts list and a few other pieces of data. So it looks like you might need to measure the barrel as well.

unitas 431



Edited by Razz
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