S-Lynn... Interesting... I am assuming your shell is date stamped to 58. Are all your shells stamped to that period?I had always thought the straight legs, torpedo t-handles and lug style mounts for legs and cymbals were 60's vintage hardware.
Yes. BD and rack are dated AUG 15 1958. FT is dated JUN 13 1959.
What I have been reading today indicates the transition from "bow-ties" to "torpedos" was in the 57-58 time frame... and was simply based on when they ran out of "bow-tie" stock. Which makes sense with one of my Krupa kits which has "bow-tie" style hardware on the bass drum and "55 lug" style hardware and push button legs on the floor tom.
According to a Slingerland ad I have seen that is dated 1958, the torpedos and claws, as well as BD spur brackets and push-button FT brackets were all new items for 1958. I have seen other 1958 kits with the previous styles of hardware, which I wish I had...just find it a little more classic-looking - not that I don't like what I've got. So, you are correct, they used the older stuff until they ran out. I guess they ran out some time before AUG 15 1958. ;)
You say you have a pre-'58 FT with push-buttons? That's interesting!
Lynn