Need more info on this 5.5x14 Gretsch snare I just picked up...

Red Sparkle finish, Microsensitive strainer, adjustable butt, 2-pad knob muffler. No keyholder (or hole for it), Responso snares. No label or stamp on the silver painted interior.

I'm assuming it's 1960s-era, but any detailed info would be appreciated! (model #, model name, pinpoint the exact year or year-range better, etc.)

Thanks!