Cuckoo Clock Birdhouse Brooch 1940's

Very rare, unusual and unique piece of yellow gold vintage jewelry. Birdhouse with red bird, clock face with hands on 3:00, and weighted chimes hanging down. I have tons of old jewelry that I'm going through & this one happened to have a piece of tape affixed with handwritten "1940's". This was wrapped in with other pieces that were Hallmark brand, but I've looked it up and there is no record of Hallmark releasing a cuckoo clock pin. There's a lot of chicken scratching on the back side with some numbers, letters and illegible sightings . The cuckoo clock, more than any other kind of timepiece, has often featured in literature, music, cinema, television, etc., in the Western culture, as a metaphor or allegory of innocence, childhood, old age, past, fun, mental disorder, etc. I will return to edit this with more accurate size measurement info.