The Eterna 1429U watch movement, introduced in 1983, is similar to the 37521 but with lower mounted hands. It features a rotor weight made of 21K gold. The technical details of this movement can be referred to the ETA 2892. It is an automatic movement with a sweep second hand and a quickset date function. Additionally, it includes a hack feature. The Eterna 1429U movement has been used from 1983 onwards.