It's buried on page 4 of this thread but here is the link to Karl's spreadsheet:
https://docs.google.com/spreadsheets...it?usp=sharing
I doubt if TTH would sell a lens without proper engraving... maybe the lens hood has been changed? Could it be a prototype? Or one not completed in the factory that somehow found a way to the outside world?
If the barrel is engraved with that patent number then it (the barrel) must date to at least when the patent was published (Dec 22nd, 1920) but that doesn't seem to sit well with a serial number of 38247.
A mystery!
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