Ringo states that his hi-hats were 1960 vintage. I believe that would have to mean that the actual period of manufacture was earlier as is always the case when buying stock inventory from music shops. In some cases this time disparity can be considerable. I bought an 18" trans stamp from a drummer who claims that he bought it new in 1970. I also know a drummer who purchased a Gretsch kit new in 1963
and bought a 1950's K old stamp "new" at the same time. These examples are common.
Jim Keltner also said this:
"Ringo always played a beautiful Paiste 602 crash-ride, and his hi-hats are 14″ Zildjians that are so old you can barely see any logo."
I don't know if that means Ringo played that 602 with the Beatles, but if so that's collapses some of our theories about the 20" he played. I had read that Mal Evans bought Ringo a 20" at Manny's on their first tour, so from that I always believed that his 20" was an A. But for me the real take away here this is Jim's description of the trademark on Ringo's hi-hats. Jim's description of the trademarks on Ringo's hi-hats as being, "so old you can barely see any logos", sounds like a description of what trans stamp trademarks would look from the perspective of someone who is unfamiliar with cymbal trademarks.
[img]http://photos.imageevent.com/drumaholic/kerope/websize/ringo-starr-big-pic.jpg[/img]
This is a photo of Ringo's first Ludwig kit in June of 1963. You can't really make it out from this photo, but from a printed shot that I have of this same photo it can be seen that the 18" shown here is not the same 18" Zildjian that he played for most of the rest of his career with the Beatles, but an earlier one. This cymbal has 4 rivet holes in it and also looks to be heavier.
My own personal opinion is that the hi-hats and the later 18" were both trans stamps.