I've been shopping that auction site for something period for a 1970 Standard tom. I've seen that the knobs come in 1" & in 3/4" sizes. Is that a "tell" on the year that the muff was made?
Also, I see many marketed as "vintage" that look no different from what's available now new, for less than the so-called "vintage" asking prices.
Some have a nylon washer where the knob meets the shell, is that a "model year" indicator? - - My '71 Standard snare came to me with a metal washer there - I don't know if that was factory issue or not.
Lastly, on some that I see being sold as "New/Old Stock" - they have bar codes on the Ludwig label. From this info on the history of barcodes:
http://inventors.about.com/library/inventors/blbar_code.htm
It seems unlikely that such an item could be older than mid-70s, and most likely later, in consideration of UPC symbols not being as prominently used on non-grocery items until the end of that decade. But, the finer points of barcodes are not my passion - heh heh
Does the color of the felt (grey / black / other) give any indication?
Oy! So MaNy QuEsTiOnS?????????