Chronograph question

padders

Seller routinely lie. I doubt that has been serviced in decades. If it is running at 5mins/day it isn't healthy. 36 hours of reserve is a little low also (but not a disaster as full wind should be 41hrs) so it could maybe benefit from a new mainspring. I like these and I have had a few. The downside is that a proper service costs about the same as the watch is worth, which is why servicing is often skimped with these. These are a very cheap way to get into a Swiss chronograph, even solid gold ones are in the hundreds of $/£/€ rather than thousands.

sathomasga

The watch has definitely not seen a recent service, or even a cleaning. Since this was a purchase, I assume it does not have any particular sentimental value to the OP. That might make it hard to justify the $500 - $800 (estimated) for a regular service. But to the OP, if you like the watch (I do, fwiw) I'd just wear it and not worry about a service. It's definitely not going to last long enough to pass to your heirs, but you can still enjoy it, probably for years.

The +5 min/day would bug me a lot though. Assuming those are the OP's pictures (not the seller's), then the OP is at least comfortable enough opening the caseback. Even if you don't have any special tools, you could take a shot at adjusting the timing. Use a wooden toothpick to nudge the small needle-like arm above the balance cock towards the "−" (away from the "+"). Make very small adjustments, and be careful not to touch the hairspring. Without a timegrapher, you're not likely to get to COSC standards, but with a little patience I bet you could get it to a more tolerable ±30 sec/day.

Bruce235

These Landerons where sold as many brands often as souvenirs at airports. Here is my Delbana, landeron 48. It needs servicing too, but gains less than 1 minute per day.