Andy,
You've got a really nice 1940 Banner Commercial. And yes, in this SN range, they were 7.65 mm.
In 1940 there was a transition in proof stamps from Crown over U to Eagle over N, so you see these poofs interspersed.
Also interspersed in this SN range were the Swedish contract guns. and a few Police which are identified by the presence of a sear safety and their caliber being 9mm.
Hope this helps.
John
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