Hi guys and gals,In 1974 whilst visiting Italy my dad bought a new certina ds ph200 dive watch. Well he never had it serviced and wore it every day at home, work you name it he was wearing it for 46 years. I finally convinced him to let me have a look at his watch. It was gaining about a minute a day. So I placed it on the timing machine and nearly fell of the chair. There was a beat error of . 1 and the amplitude was 215 degrees and gaining 153 seconds a day. But the screen had 2 close lines very straight and no snow to be seen indicating that it just needs a service. But when I opened the case back I was meet with the white chewing gum substance that looked like the original movement spacer which decayed over the years. I thought I would share this with you. Dad payed 24 dollars for it in 1974 brand new. Looks like I'll be working into the night.