My first drum set was a Ludwig club date I bought new at the music shop where I took drum lessons from a drummer who studied with Gene Krupa. I bought it just before Christmas 1965 and it did not have the plates you speak of. I the shells were date stamped Oct 1965. The set sat on the shelf for a few months till I bought it. Earlier that summer I placed an order for a four piece Super Classic in sky blue pearl. Due to the Beatlemania inspired interest in Ludwig, demand caused delays in deliveries and I finally got tired of waiting and bought the club date which was silver sparkle. The Super Classic came in about a month later and I forever wished I had waited. I played them for six years and then switched to Rogers.

I was not a fan of the straight legs and the spring loaded lock so later on I switched to the solid bracket and curved legs.

It looks like it might be the same plate that they mount under the four screw rail mount?

The Ludwig 67b drum outfits catalog does not show the plates.

I also pulled out old pictures of my club date I bought in Dec '65 and verified that my FT did not have the back plate. The photo is dated Oct 67. I will try to digitize a couple photos and post if successful. I have one photo that I've always liked because the silver sparkle shows extremely well from the camera's flash. I bought the Ludwig direct pull hi-hat and speed king pedal with the set 'cause I felt they were the best Ludwig had at the time along with the flat base cymbal stands. It had the Acrolite snare which I bought months prior to the rest of the set as I earned the money.