Our local drum shop has these on consignment. I know they got the date from inside the bass drum. I know the heads are very old and probably from the era. I know the hihats are very small, bent and trash-canny.
That's all I know... but the people there are very knowledgeable and helpful so if you have interest, call them. I hve no vested interest, but they're cool and I figured you guys would like to see them.
coalitiondrumshop.com
Cassidy