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Old school 2893 063C


Mickey Padge

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Hey fellow RWG'ers! :)

I have an old school PAM 063C, and the trouble is the Jakob case back will not screw down, it leaves a 1mm gap after a few turns......

Anyone else have an old school GMT PAM (029/063) and been successful with Jakob's sweet custom case backs?

Original case back on the left, Jakob's on the right....

Click to expand:

caseback2.th.jpg

I thought at first the case back might be pressing against the movement retainer, but decasing the whole movement disproved that theory. So it screws on a few turns as smooth as butter, then just stops with a gap, easily large enough to place a finger nail.....

Any help would be greatly appreciated! B)

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There is a batch of Jakob 63C casebacks that had a wide threaded rim and a wider slope. It is based on stock for a thicker 7750 movement & rotor, and as such it may not screw in all the way into a manual case (the rim will hit the movement bridge) or an oldschool auto (the rim will hit the movement ring or run out of threads). Besides it being incorrect for a 289x watch due to appearance of the slope it's also incorrect in design. OEM and Honpo/EL 289x caseback has a movement ring holder.

7750 caseback (PAM88):

S12147%202.jpg

289x caseback (PAM63):

DSCF2655.jpg

OEM caseback showing movement ring prop holder:

post-11419-0-01492300-1300814144.jpg

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