"42" was also a concealment code used with Mauser made Lugers in 1939 and 1940. If the chamber has "42" over it, that is a date, and the toggle didn't leave the factory on the gun.
Depending on the appearance of the "42" on the toggle, it could also be an armorer's replacement part. They were marked in this way.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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