This would have to be the most common service job, 6139 chronograph.
This example was particularly nice, basically just nice all round. I was having a bad day with lighting so you can’t see the applied SEIKO logo on the dial.
Only a straightforward service, barrel arbor jeweling and seal replacement was required.
I don’t see a lot of LCD style watches overall, most of them are fried by battery leaks or other issues that kill these watches.
This one got a full set of seals, NOS crystal, new battery and general clean up. It must have always had quality batteries installed as there was no sign of battery leaks but had water intrusion due to failed seals. Despite having a water resistance rating of 150 meters, they were never really better than splash proof due to the number of possible entry locations for water.