I recently posted about a fixer upper I picked up on eBay. I sent the watch along with two donor movements to my usual watchmaker and unfortunately they all have a broken fourth wheel. The movement is a cal 320 from the 1930s/40s. My watchmaker has messaged to say the usual places for parts don’t have what is needed. Does anyone have any ideas of where I might be able to look for the part?

 

http://www.urdelar.se/Omega 321-1243, Fourth wheel

Will this fit?

 

Apologies I think I have mis typed the Caliber it is the r17.8 also known as 302 later on

 

https://www.ebay.com/itm/Omega-caliber-302-fourth-wheel-part-1243-/283425695770Purchases made through these links may earn this site a commission from the eBay Partner Network

This one?

 

https://welwynwatchparts.co.uk/products/omega-calibre-r17-8-movement-parts-used?variant=41572602377

Or this one with extended pinion?

 

This is the exact part. Thank you !