My name isCustomerand I would love to help.
Please use the Add Files feature to add pictures of the watch, dial, inner case (where there will be marks, words or symbols) and the movement.
The serial number on a watch is on the movement (gears area) and not on the case. Those are always two different numbers.
Add pictures one at a time( add one, hit send, then do the next).
Once you do, give me some time to research.
No need to sit by the computer, you will get an email when I respond.
TO GET TO THE SERIAL NUMBER
To open the back cuvee( dust cover), you can use the edge of your fingernail or the edge of asharp knife at what would be the 2 o'clock position if you looked at the cuvee in terms of a clock face.
There is a raised lip in the region that allows for leverage to pop the case open.