I tried changing the crown on my 105.012. The crown sits snug on the case but the stem I had on the newer crown is to small for tthe flat foot crown. I'll have to find and adaptor to fit the stem. Sorry for the picture quality. I know the pusher is the next issue.
Sorry to resurrect an old thread but the Seamaster and Speedmaster 321 24 teeth crowns had a difference in height (or thickness)
3.0mm vs 3.8mm. @pilotswatch what you have pictured above is ofcourse a Seamaster crown.
I'm on the hunt for a 321 flat foot Speedmaster 3.8.mm thick crown if you have one available .
I always wondered where crowns go to die and why 40% of the watches I see, that I want have a mismatched crown. Did you happen to find a bin of left socks as well? Good find!