Here's a 20" from the same era. In a poll taken on Cymbalholic comparing this one to an old K., 80% of the respondants said they thought this was an old K. And they thought the old K. was an A.
[img]http://photos.imageevent.com/drumaholic/elvinscymbals/P1010038.JPG[/img]
SOUNDFILE LINK: