OMEGA case identification

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Hello all,
I have this very nice Omega pocket watch from 1906-1907, handed over to me from my great grand father.
it has this interesting finishing on the silver case. some kind of embossing (omega logo) and the space between filled with a kind of resin. Looking for some expertise on this, why they did this and is it maybe rare, and how to repair it.
See the pictures.

Thank you fopr your ideas.
Reinold