Proper amplitude for Unitas 6497

[beastomaniac]

How much is proper amplitude for Unitas 6497 based caliber (Panerai OP X)? My PAM00210 was just cleaned and oiled by local watchmaker and it currently runs at 240 degrees when fully wound, which sounds quite low to me. Measurement was done with 44 deg. lift angle.

[szbalogh]

Yes, it should be 270 at least. 

[Marc]

Nothing like getting some actual data so I have just put my own 6497's on the timegrapher.

I have a 1960's Le Cheminant pocket watch with an original 17 jewel UT6497 running at 18000bph which I have just serviced (last weekend). Still using original Ms and with the lift angle set at 44° I am getting 271° amp on full wind in the horizontal.

I also have a modern De Tomaso wrist watch with an Asian 6497 clone running at 21600bph. It's about 3 years old and I haven't serviced it. With the lift angle set at 44° I am getting 290° at full wind in the horizontal.

I would say that 240° at full wind was a little low for a freshly oiled modern movement.

[beastomaniac]

I'm wondering what should I do with it... Is the amplitude tolerable if I sell my watch forward or should I take it for a proper service? All the stones were clear and proper oils were used as per watchmaker said.

Sent from my SM-G930F using Tapatalk

[jdm]

My opinion only. The amplitude is acceptable to either keep or sell it, and one should look at the overall practical performance of the watch to judge.

[szbalogh]

Yes, like jdm said. If the rate is the same or within 5-10 sec/day difference in the different positions then its ok. Many thing can couse low amplitude. I suggest to check amplitude again after a few days. All the watches i serviced had different gain in amplitude after a few days.

Maybe i make something wrong  

[JohnR725]

I assume you meant 6497-2 which runs at 21,600? So because I wasn't 100% sure I've attached the specifications for both the 18,000 version and the 21,6000 version timing specifications amplitude etc. You notice they only give a maximum amplitude not a typical running amplitude. The only way to really tell if what you have is right is to wait 24 hours and it has to be better than the minimum.

Then in real life you don't care what the amplitude is sort of. Normally people are more concerned about timekeeping not amplitude unless they're having a problem with timekeeping. What you want to look at is the isochronism number variation from fully wound until 24 hours later. If you're getting that who cares what the amplitude is?

[beastomaniac]

Thanks for your opinions and hints! The watch runs in 0.0-0
1ms beat error and about -1 to +2sec per day in all positions and the line is almost perfect.