I am working on a vtg. Citizen cal.7520 automatic movement.
I have put the watch on the timegrapher
The graph looks OK but the beat error shows 9.9ms. I presumed that beat error should be around 1.0~2.0 given the shape of the graph.
Is the beat error actually bad or the timegrapher is wrong??
Padd here from the UK.
It all started with a desire to fix a Submariner replica I bought off a lucky lucky man in Pisa, Italy while on a European tour.
Next thing I know I'm investigating Submariner replicas and building my own, signed by me, using a Seagull ST2130 movement, adventure watch.
Now I'm hooked, I took inspiration from Marks videos, now I'm happily starting to work on parts of the movement, and have recovered one or two movements where the stem came out, but wouldn't stay back in. I have built a few watches for friends and relations, but now I need to be able to service them when they come back to me.
I also have a couple of movements that run really badly, so I will be practising on those over the winter weekends. Full repair/servicing kit IS my Christmas present.
I really want to get one of those ST2130's, serviced and tweaked by me, doing a -------------------------- on my timegrapher. not a -.'-.'''--,'.'.' (and worse) that they do at the moment.
I wont start to list my watch collection, but it runs from a Casio digital to a Rolex pocket watch with Seikos, Citizens, Omegas and home builds in the mix.
Must do Mark's course, but I'm afraid I may have already learned 60+% of it already.
So I haven't been updating this much as it was taking a super long time to get parts. I was able to order a new balance staff buuuut in the process of switching over the hairspring and little jewel thing (still learning) I damaged the hairspring quite badly. Before attempting this operation I made sure to check that I could order a complete balance from jules borel, just in case. So, $90 later, I had my new balance.
I was actually able to clean up the modifications that a previous watch "repairer" had done. I think they were trying to use a balance staff they had lying around to just get it running again but they really just made a mess of it. Putting everything back to factory brought the endshake into an acceptable amount. It's been running for a few weeks now without issue. Super happy to finally have fixed this watch and be able to wear it!!!
So I just picked up this watch from Ebay, thinking it would make a great special occasion watch. I figured I'd be able to identify the movement after disassembly but I'm afraid I'm just as lost as before. Does anyone have any ideas on what this could be?
What I know:
It's an Ollendorf movement. Ollendorf was an importer of watch movements. They have a cool logo.
The only markings are a 315 under the dial, which doesn't appear to match any movements in the Ranfft database.
Any help is super appreciated!
Some updates, I measured the mainspring barrel of a 6498 and it's 16mm. I also tried loading a 10mm mainspring on an undersized winder, it did not load fully. So I answered my own question hehe. thanks.