After the previous post with a watch that was virtually as new, this one shows a watch with more than a few issues. I got this Yema Superman in from an existing customer in Scandinavia who collects different interesting watches. This is an uncommon watch, rated at 990 feet and with a lockable bezel. Certainly interesting but it has some issues, with a broken crown and completely seized bezel because of corrosion on the outside of the case. It doesn’t look hopeful for the movement condition…
The case opens without too much drama but it’s clear there has been some water ingress. It’s powered by an ETA 2452 which is a pretty robust movement and can be set up well when in good condition.
It’s not easy to extract the movement due to the corrosion but it comes out and I turned my attention to separating the bezel from the case. It takes some time and force but, eventually the bezel and spring are on the bench – it’s clear what the issue was here.
The case is corroded as well but it’s not too bad overall and should clean up well.
As a small frustration, the second hand pipe separates from the hand during removal of the hands.
That is rivetted back on.
A lot of the parts on the top (rear of the movement) had to be removed before the dial as one of the dial screws is solid rust and proved impossible to extract. The screws enter the plate tangentially as shown with the red arrows and clamp on to the dial feet in the holes shown. The one on the left had the issue and as a plate is available for a reasonable cost the plate/dial screw were cut from this side. The dial was then free and without damage. One of the corroded case clamps can be seen on the right as well.
There are a lot of parts affected by corrosion and, although parts availability for this calibre is pretty good, I opted for a “NOS” movement from eBay to reduce costs. I don’t usually do this as you don’t know what you’re getting and in this case, my fears are realised. The movement doesn’t look too bad.
But after stripping it’s clear there is wear to some of the pivots and even significant damage to one of the jewels on the plate.
Fortunately, with two sets of parts to choose from, there are enough good parts (with a little pivot polishing) to build one working movement. The base movement is built, refitted to the movement ring and it all looks very nice.
And initial performance, after some adjustments, shows good amplitude and even running. This is just dial up after the movement has run for 12 to 24 hours. A beat error adjustment is required but that will be done after the movement has run for a few days.