UG service needed-where to have my Polerouter serviced?

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My Dads UG Polerouter that I put on a new strap and wore for the first time in many years is running about a minute fast a day. I live in upstate NY and would like to have it serviced so it keeps better time and the fact it is from like 1956 - 1960 timeframe I'm guessing. He bought it in a PX in Turkey while he was in the Army. Anyways can someone recommend a place I could have this reliably serviced?