50's Oysterdate Precision Runs 5 minutes fast per hour

[higgibs]

Greetings... I am new to the forum. My wife just bought me a 1950's Oysterdate Precision manual wind for our anniversary. It's running about 5 minutes fast per hour. The case, etc are all in fine condition. Any thoughts on what could be causing this?

Cheers,

BSH
Long Island City, NY

[Tools]

It could be any number of things... some that it may be are:

. a bump may have caused the hairspring to catch on either itself or the half bridge

. it may be magnetized

. the regulator may have slipped to the plus side

. parts of the escapement may be misaligned/damaged

all of them could be sorted out by a watchmaker in short order..