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Longines VHP accuracy

40134 Views 122 Replies 14 Participants Last post by  ronalddheld
Fellow watch nerds!

I have a Longines Conquest VHP watch that runs too fast. Faster than the 10 seconds per year that Longines advertises with. My watch gains 5 seconds per month. Almost a minute per year.
I have been keeping an eye on it, for a few months now, and it is very consistent at gaining one second every 6.5 days.

It might be due for a new battery since it is almost 8 years old. The second sweep still moves every second though.

It has been quite good so far, although I have not paid it as much attention before. I think it used to be one or two seconds out per month.

Anyone else has experiences with a VHP? I read that the rate can be adjusted when serviced. Is that a good idea? Who could do that?

It is a 1999 Conquest Perpetual Calendar Calibre 546. It has 'L1.632.4' inscribed on the back. Not too sure what that stands for.

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3. For ETA 255.563: Connect a wire (or needle on the wire) to the '+' of the battery; tap the 'C-' or 'C+' terminal X times then wait 5 seconds then disconnect wire/needle.
As an electrician I would recommend to do that in slightly different way: connect a wire (or needle on the wire) to 'C+' or 'C-' terminal; tap to the '+' of the battery. It's easier to hold steady connection on small 'C' terminal while tapping the large '+' battery area and it also doesn't scratch golden PCB pad of the movement ;-).
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