Wooden 2 sided puzzle

I bought this at a garage sale from an elderly lady. On the bottom of the first puzzle pictured it says: 811-1 -- Post Office and across from it says Copr. The Knapp Co., Inc. N.Y. On the second picture shown it says: 821--Little Bo Pee, (yes Pee) and below it: Copr The Knapp Co., Inc. NY.

I have been unable to find anything online about and am curious what time period it's from. I hope to find a double sided frame so I can store in that and see both sides when I want to turn the frame around. It's such a sweet puzzle on both sides and I love it!