I’m not surprised that jump hour watches didn’t conquer the market, as they aren’t very easy to read. I find it takes me a lot longer to figure out what time it is on one of these than on a normal display with hands.
The crystal is pretty scratched, and the dial has some damage, but, overall, it’s looking good.
Inside lurks a pleasant surprise – a clean Förster 221 automatic movement with 25 jewels, and the hairspring looks good. I might have a chance here! These movements were made in Pforzheim in Germany.
The three rings that indicate the time. The hour ring is a “jump hour” ring, so every full hour, it will take only a couple of minutes to jump from one hour to the next. The minutes and seconds don’t jump, e.g. they continually turn to show the time.
This is a very nicely constructed mechanical movement with auto-winder.
Now it’s time to remove the dials. The second dial just lifts off, and so does the minute and hour dial. That takes me a good half hour to figure out, as I don’t want to break anything …
The jump hour mechanism – the pawl is already removed.
A pretty complex movement.
I start off with a new mainspring.
The gear train in place.
With the mainspring barely wound, this is looking very good.
Time for the three time wheels. Two rivets have come loose, and I have to re-rivet them.
With the staking set, I tighten the rivets.
The two rivets back in place – one keeps the hour wheel pawl in place, and the other provides a sliding surface for the hour wheel.
Wheels and dial back in place.
Now the auto-winder assembly goes back in.
I’ve polished the crystal, and the watch looks pretty good again! I know that the marker inside the crystal should go over the left, but the crystal only fits properly this way. Better not to have it obstruct the dials, anyway.
This one will stay in my collection.
And, of course, you need a really fat leather strap to go with it!