Spillman case, VJ22/23, inverse pushers. Are they rare?

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German Kriegsmarine Issued Vetta Spillmann. It was the watch of the Captain of U-997 Hans Lehmann.

 
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Does anyone here has an idea in which year these inverted pusher spillmann watches appear? I was reading 1943, but is there any documentation like catalogs or something? Anything earlier then 1943.

Thanks Nico
 
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Picture of a 1930's Doxa catalogue:
1939 to be exact 😉
 
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1939 to be exact 😉

Thanks Mark. Do you have a link to the catalog or can you send it to me maybe?

Nico
 
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No. I have a physical example and this is a detail pic of it.
 
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I found two more ads. The one from Mulco is from 1939, the Doxa from 1940 obviously.