It is always fun to announce a new discovery of a vintage series. These are animal couples that fit together snuggly as the boy wraps his arm around the girl. Notice how all their eyes and posturing match. Each set has a "Made in Japan" sticker, circa 1950s-60s. Each set is also stamped with a sequential letter-number combination:
H406 - pigs
H407 - squirrels
H408 - monkeys
H409 - dogs
Do you think these four sets are the complete series? Or do you think an animal or two stamped H405 and/or H410 exist? Keep searching.