I have a seamaster cosmic with a two part case and was enquiring if anyone knows how to remove the glass and rear case back. I believe one has to use air pressure ?
Another less than successful design by Omega in my opinion. These watches have a two-piece stem. The crown and its stud must be pulled out assertively to enable the stud to separate from the stem. Then, a spring bar pusher is inserted into the case tube and pressed inward to return the stem to a wind position. Then the whole thing, case back, movement, crystal, etc., is pushed outward from the back, toward the front.