Anyone know the first year set-o-matic shows up with the Slinglerland logo appearing in the lower flange? I know the "patented" portion shows up in 1971...and "patent pending" was just before that...1969/70? And when did the torpedo style T-rods stop being used? In looking at a vintage 1960's Slingerland kit, the bass drum tom mounting plate seems incorrect. The badges are gold/black with serial numbers under 100,000....suggesting mid-1960's. But the set-o-matic mounting flange seems later than that. It's chrome plated, and stamped "Slingerland"...not sure of the patent pending/patented portion. For an earlier 60's kit I would have expected an unstamped flange. It doesn't help that the tension rods are all 1970's style too (not the torpedo style ones). I've seen kits with serial numbers just over 100,000 still using the rail mounting system....at least for single tom. For a dual rack tom you'd have to use some sort of pre-set-o-matic mount. Thanks for the help.