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.