Hello, I have a 2531.80 Seamaster I acquired within the last year. Previous owner included receipt for full overhaul service shortly before my ownership. Service was done at a local watchmaker and promised -1s a day and 300 amplitude on receipt. However, I've measured the timekeeping recently and I'm not sure if it's a sign of a needed service. The amplitude was always under 250 ever since I received it, it didn't matter as it ran fine for me so I kept it, but I've started to get concerned as it seems to have more variance, and on average wear it loses time. I would like your opinion. Should I send in for a service? Or keep it going a few more years as is? Thanks Dial up: +4 seconds a day. 235 amplitude. 0.1 beat error. Dial down: -7 seconds a day. 249 amplitude. 0.0 beat error. I'm also keeping track of power reserve and see how far I come to the 44 hours on this caliber 1120. I should know by Friday. I did wind the watch manually, and didn't feel like I wound it too much and yet I could feel the main spring slipping. I'm wondering if there is a problem with main spring/barrel.