Serial numbers don't work with Monroe keystone badges.They only work with 60's keystone ,and Blue/Olive badge till 79.The white interiors would indicate a drum was made before 69.whoops! Did I miscalculate the year? I think I did, sorry. I used this chart here...
I guess mine's off the chart (sorry!)... So they went back to the keystone badges, I see. Confusing. It says Monroe NC by the way.
I tried the link, it's working and it's set to public.
No rings, no white paint. Looks like it could be maple or birch or both. How do I learn which it actually is?
I had a hard time finding a perfectly flat surface, but I finally used a new piece of Birch 3/4" plywood. There's no light escaping. The edges seal tightly.
The drum shell is at least or about 1/8" out of round. The diameter varies from exactly 15" to just over 14-13/16"... What can be done about that?
The shell should be 7-9 ply maple/poplar,mostly maple,depending on the year it was made.Putting a shell back in round might be possible with a mold.Being 1/8 to 3/16 out of round on a 15" drum isn't terrible,so given your bearing edges are in decent shape,the rim you say is bent is probably the culptit.
When you put the heads on ,can you spin it around the drum,or does it get rub tightly on the shell?If it touches just a little or spins freely,you're in good shape.
You actually can fix that rim by bending it slowly over the edge of a table.Take your time and it should go back into shape.