Vintage Made In Japan Carved Bone Floral Pin Brooch

This pretty bar vintage brooch is in wonderful vintage condition. It is marked "Made in Japan." Back appears to screw into bone, rather than be applied with glue. I am not an expert - I'm just old. hehe I'd think, given the clasp, that this might be 50s or older. That just under a hook clasp was from the era where heavier cloth was used. Please see photos, as they include measurements, too. Thanks. I welcome offers and Love bundles. I mean, really love them.