A little googling brings up this edition of Flight from February 1942 where the image appears as part of an article on the new Merlin XX engine:...
Type: Posts; User: Stuartbaker104
A little googling brings up this edition of Flight from February 1942 where the image appears as part of an article on the new Merlin XX engine:...
Try asking Alex Barter at Black Bough. He may even be able to help source a replacement.
https://www.blackbough.co.uk/found-in/watches/vintage-watches/
It’s hard to tell the full profile from your photos, but are you looking for something like this...
https://www.watchobsession.co.uk/pages/hirsch-leonardo-curved-end-fitting-guide