I've been told that this EK1 shown here is a second core variation of S-W...
Steve, the EK1 you show in the very first post is one of this type so, with respect, I believe it's probably S-W's first core, speaking chronologically, rather than their second.
Finally, I will add a shot of mine, since the hardware differs from others shown so far here:
Best regards,
Streptile
Looking for ROUND BUTTON 1939 EK1 Spange cases (LDO or PKZ)
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