Servicing a Tissot D377

I recently purchased this Tissot D377, twin timer, but I can't seem to figure out how to remove the case back.

I saw some images where they had it removed and it look like it a was quite easy, but I can't seem to figure this one out.

There are no screws to get off like the TS models.

There seems to be some corrosion inside, but it's still working so I'm looking to clean it and put it back together before it completely dies.

Any help here would be greatly appreciated.

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When in doubt,farm it out.