I recently was given my Great Grandfather's calculator watch as a gift. Looks to be in fantastic condition. I simply pulled out the crown, and it was back and running again and lasted a good 30 min. Then I realized something... This is an extremely vintage watch that has not seen the light of day in 25 years. So I panicked and set it down to die out. I believe it should get service and relubricated before I wear it and cause irreversible damage. Does anyone have any idea how much it would cost to service this beauty? And anything about it's lineage?