Normally an armorer's replacement plate would have the "42" digits together. If you can post a picture it would be helpful.
Again, a picture would help, but the "H" is probably a factory inspector's mark. There will be many of these all over the Luger in inconspicuous places.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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