I would be interested in a few more pics, maybe some from the inside, pics of the muffler, and close-ups of both strainers.
Isn't that a rusty vent grommet by the small knob in the middle pic?
As to the maker of this drum, I also believe that this is a Pearl made drum. The tensioning knob on the strainer is the design that Pearl used on some of their drums and on the Tempro branded drums. The way the lug is designed also points toward Pearl (especially the base of the lug where it attaches to the shell.)
The hoops, however, I think are very possibly aftermarket. I have a few examples of 60s MIJ Stick-saver copy hoops and none that I've seen have the protruding holes for the t-rods like these do. I dont think that they were original to this drum.
I also think that someone added another strainer to allow for more adjustment. I doubt it originally came with two strainers (but, of course, I could be wrong.)
The mirror chrome shell is not the usual 60s or early 70s MIJ fare. They usually came with a center seam or 3 lines or 2 spaced out lines. So, this makes me think the drum was produced a little later, maybe mid/late 70s?
You also might check to see if the snare strands are original. They should have a 'Made In...' etched at one end of the snare. Also, check your strainer arm for a 'Made In...' as well. I still wouldn't rule out the FrankenSnare idea...