Robert56:
When I was in Jr. High, mid to late 60's the paddles were all made in either wood shop or the industrial crafts shop.
Believe it or not, my elementary school had an industrial arts shop for boys. That's part of the reason I grew up knowing how to "do things" for myself, long before Home Depot. It had all of the normal wood shop things, but our teacher always stressed practical things. For example, we practiced repairing the guts in a real toilet tank and fixing real working faucets.
And paddles? Yes they were made there. Some students made them to take home, and the shop was the school's source of paddles. Only certain of the school's staff seemed to be authorized to paddle, and the shop teacher was one of them. I suppose that's the benefit of being the school's source of paddles.