What do the records say...

[edgarspencer]

Sounds like you've done your homework. I would certainly think it's an 0 frame, so if you measure 1" between pins, that would confirm it.
If you think of it, get a sideways shot of the barrel lugs, and down on the water table.

[Bill Murphy]

No need for a picture inside the lock. Thanks.

[John Cinkoske]

I have a number of photos in my Photobucket of the 20 Gauge Top Lever Hammer gun in this thread, but can't seem to upload them.
Help?