They were using the new handles in 58; I don't know when they made the switch, but grey paint 6-ply with new handles and no tag is late-50's, early-60's; I'm not sure you can be more exact than that. What kind of hoops are on the drums - if cast they are probably later in that time range (early 60's); if stick-choppers they are earlier (late 50's).Maybe you're right about the floor tom, but it sounds more like a Slingerland - is it grey painted inside like the others? I assume the lugs are the same - take off a lug to see if there is evidence of a different lug ever being used. Does it have the RB attached with a pin? Possible that Gretsch ran out of their own shells and bought a couple from some competitor, but much more likely that someone added a floor tom to their set later (which happened a *lot*) or maybe even at the music store. This kind of stuff wasn't such a big deal back then.
Thanks for the info - this is my set, they are me, my identity - I bought them w/K's for $125 in 1972. I still have all of it, except for a horrible AZ 22" that sounded somewhere between a train and a lawn mower. I have the original old K hats and 17" K whatever you want to call it - ride, crash... it's my Holy Grail cymbal. Stamp dates the K's to 50's.
The floor tom: I've had it apart and it matches the set in every way except for the reinforcing hoops. Everything about the shell, except for the hoops, screams Jasper. The RB badge is attached with a pin, and the paint, everything, matches the rest of the set identically. I have Slingerland drums and it resembles a Slinger in no way. When you remove a lug they fit tight in the holes like the rest of the kit. From the bearing edge, except for the reinforcing hoops, you can see the wood plies are the same as the rest of the set.
The set has COB cast hoops and the kick still had the front calf head on it.
When I bought them in 1972 they looked really old at the time, it's hard to believe they would have been only 10 years old then - I've never seen pearl that cracked and faded in 10 years, so I always guessed they were late 50's to make them at least 15 years old when I got them.
Another note is that when I recovered the drums in (A.F.Blaemire supplied!) pearl the floor tom looked identical to the other drums when stripped - you could have sanded them and varnished them and the drums would have matched perfectly.