Aqua Terra w cal 2500 question

I've owned my Aqua Terra (2503.5) for about 8 years and it has always had almost no winding resistance. I've owned other Co-Axial watches, although with the 8500 series movement, and they had far more resistance. The watch was given a clean bill of health by the local OB not long after I bought it - they state it ran great and no service was required. The watch keeps great time, a few seconds a week! If anything the resistance has reduced over time and is now almost zero. I have not tested how long it will run for and have wondered if the watch would still run if one of the main springs failed.

Should I be concerned? It is probably due a service but it runs so well at present!

Yep I have a 2503.80 for 15 years now and the winding has always been very smooth with no resistance, almost feels like the crown is not connected to anything.

BTW, I have always felt this 1st gen generation of AT is among the best - simple dial and classic hands and markers that give it a vintage look without being vintage. Todays models have the deck lines and the minute numbers and sharper markers and ornamentation which to me is more busy. Never selling this one...

They do run great, but it can be deceiving.
I assume you're unsure of its service history and all things considered it probably could use a service.
That's the conundrem.
Service it in order to make sure it's perfectly healthy and potentially have a shift in timekeeping for the worse.
Or don't service it and let it chew itself up a bit before it stops.
Back in the day when it was made. It was a COSC movement with about a 7 year service interval(if i recall correctly).
You decide👍

I have found that manual winding resistance or characteristics is a rather poor gauge of whether a watch needs a service.
Observations around timekeeping are more appropriate for the layman as far as I'm concerned.
Any variation from the normal timekeeping would definately be cause for me to service it.
I have one with a 2403 movement that ran perfectly at +3.5 seconds per day from new with infrequent but hard wear, then after about 13 years it started to gradually slow down to run closer to +1.5 seconds per day.
After it was serviced it remains at around a solid +1.5 seconds per day with barely any difference in manual winding feel, but I can see that the Automatic winding rotor spins much more freely like it did when new.
That's all I know about my watch👎
The ETA 2892 movements aren't all that hard to wind.

It may need to be opened up by a reputable watchmaker to have a look inside to see if you can kick the can down the road a bit, but then again it might be prudent to bite the bullet and have it properly serviced if you respect the watch and intend to keep it😉

And the earlier Co-axials are thinner, thus adding to noticeably increased comfort. IMO👍

Thanks for all your thoughts on this. Sounds like all is well, although I do think I owe it a service before too long. I do like this watch, as noted it's thinner than the later versions and has a nice clean dial design. I've worn it quite a lot over the years often in preference to other "similar" watches - a 116200 Datejust, for example, which has recently been sold as it did not get enough use.