Help me identify this brake drum

The best I can tell there is a big M in the upper left, 3HE just below the middle on the left and TM below that. On the bottom right is a big E. The drum fits the hub fine. The shop replaced the shoes because they hit the ground when the drum flew off. I don't know if they are the same as what was on there before, but they're 1.75".

I think 10x1.75" is also a B-body size.

Here is a picture of a front drum on a '68 GTX... looks identical.

http://www.moparmusclemagazine.com/...lymouth_gtx_disc_brakes_install/photo_03.html