Rolex reference # 18078, serial Rolex reference # 18078, serial # 6,588,689 # 6,588,689 New in 1980New in 1980

Caliber 3055, serial number Caliber 3055, serial number 05850140585014

The dial may be original that The dial may be original that has been refinished. In any has been refinished. In any

event, it needs refinished now.event, it needs refinished now.

Reference number between the Reference number between the case lugs.case lugs.

6,588,689 case serial # found 6,588,689 case serial # found between the case lugs.between the case lugs.

Movement serial numberMovement serial number

Inside of the caseback.Inside of the caseback.

On April 20, 2005 this watch is On April 20, 2005 this watch is performing very poorly. The timing performing very poorly. The timing computer can only check it in three computer can only check it in three positions- all others are outside of positions- all others are outside of

specifications.specifications.

This is what the screen SHOULD look This is what the screen SHOULD look like- +/- one second, less than .5mslike- +/- one second, less than .5msand approximately 300 degrees of and approximately 300 degrees of

amplitude.amplitude.

The computer could only find 3 of the The computer could only find 3 of the eight positions to measure. This one is eight positions to measure. This one is

crown down.crown down.

Measured in the crown up Measured in the crown up position.position.

Best rate. This watch needs a Best rate. This watch needs a proper service.proper service.

After thorough examination on After thorough examination on the timing machine and final test the timing machine and final test

winder, the watch needs a winder, the watch needs a proper service. The mainspring proper service. The mainspring is not slipping in the barrel and is not slipping in the barrel and this causes “re-banking” when this causes “re-banking” when

the watch is fully wound.the watch is fully wound.

Other than the very poor Other than the very poor performance of the movement performance of the movement and the flawed dial and hands, and the flawed dial and hands,

this watch seems to be as this watch seems to be as described and otherwise in nice described and otherwise in nice shape for a 25 year old watch.shape for a 25 year old watch.Jon W. Horton, AWCI/CMW, Jon W. Horton, AWCI/CMW,

MBHI, SPWMBHI, SPW918.592.0870918.592.0870