Omega Seamaster 100 Laps Memory

Step 1: Find a 10 HKD coin or a similarly thick coin of any currency

Step 2: Insert the Bergeon snap-on case opener tool and this @#$%^&* case back will open like a beauty!
Important! Tilt the watch until the bracelet is flat on the working pad, otherwise you will bend the link pin of the endlink!

Step 3: Replace the Renata 394 battery, have a look at this beautiful 5 motor movement, take a movement picture and close the case back. Remember this page, you will have to come back here in 2 years

Lesson
The case opener knife and any other tool did not do the job. Even the watch was securely fixed in the movement case holder and that one again fixed in a vice. Think and do not try to push things. I am very happy that I managed to open this case back without leaving any marks. Not to think how angry I would be had I left some ugly opening marks. WIS (watch idiot savants) tends to "see" scratches even they are on the back of the watch while wearing it