My son Dan and I went to our local Sam Ash which tends to have a nice supply of vintage A's. We found a very nice 20" trans stamp. The lathing and hammering and bell shape look older to me than the other 20" trans bop ride we have. That one is probably from the early '50s. I'm guessing this one is from the mid-late '40's. I'll try to put up some pictures and a sound file soon. The best part was that it was only $134. I know prices are soft right now, but I thought this was a good deal. Its worth every penny.
Between the two of us we have around 25 rides and crash/rides, but my son loves this cymbal so much it's now become one of his "go to" main gigging rides along with a Istanbul K 20" new new stamp, a 22" KCon MTH, and a '50's A large stamp.