Regula 25 Mvmt is a the most commonly used ONE DAY weight driven cuckoo clock movement. It comes complete with bird rod, chains, stop rings, weight hooks, hand nuts and an extended post for the music activation lever. Regula 25 Mvmt requires 2 weights of 275 grams each which can be purchased separately. Number 25 is inscribed in the middle of the back plate. The right back side of the movement has no vertical writing.