This is a charming Helvetia watch, coming from the UK for a service.
It has an in-house movement as most of them do. In this case, it’s the Helvetia 830 with an unusual design.
The ratchet wheel, the crown wheel, and the click are “hidden” underneath an extra cover. This movement also has an intermediate wheel between the 4th wheel and the sweep second pinion.
It’s always fascinating to see something that isn’t like most movements and it keeps it interesting.
The watch is from the mid 1950s.
I received this Helvetia watch in a batch from the united kingdom.
It didn’t run too badly, however, it did have an amplitude on the lower end and it was nearly one minute slow. Also, the movement itself was filthy. A few very little hairs and dust particles.
Finally, it seemed like it’s been previously over oiled. Little puddles of oil were on the base plate and underneath the barrel bridge.
The movement is the in-house Helvetia 64. A hand winder with 17 jewels. It’s a 13’5 ligne movement so it’s rather big for a vintage watch.
I’d date this Helvetia watch to the 1950s.