I was also going to ask for the serial number. Being the brass frame is in great condition, the bottom of the butt-frame should be readable. It also looks like the gun may have exploded, maybe using HV 22 Shorts?? The cylinder looks to have split at one chamber and knocked out a chunk at the face of another chamber. It would be great to see the cylinder from the front.
It could have been a neat story, but likely that story was lost to history.
Now that makes more sense. This image tells us that the cylinder simply corroded away over time and did not explode. One will never know how long that revolver has been in the ground, but my guess is that it was there long before WWII.
I assume you own that piece and did a lot of cleanup? Looks nice either way. If so, did you discover it?
That's definitely a 6th variant gun. I'd put the shipping date around June of 1860. Could have either been made on Market Street or in the new Stockbridge Street factory, which would have been operational at that point.