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Little Tissot I'm working on.

Trying to figure out what is this Plastic piece on the back. Opened the case from the front and removed movement.

This seems like a plastic part, with some rust buildup on the outer face.

Anyone have any idea?

Can I clean this? Replace?

Caseback says 'Tool 108' on the outside, case number seems to be 44648.




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Based on discussions I found in the WWW it should be an opening for regulating the watch in the factory after assembly. Please confirm by checking the position of this plug relative to the balance wheel. I would leave it alone.

Edited by Kalanag
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