Agree, I doubt even a master gunsmith would have gone through the trouble of serializing the barrel and cylinder to match the frame.

Don't know if you're planning to buy it, but an SWHF records search (after a letter of authenticity) may turn up information on it.

So the thread title could be "S & W 1917 US Military 'converted to' .38 Special with Matching Numbers".

__________________
Alan
SWCA LM 2023, SWHF 220