Another Rebberg & a Case Query

[Hilts]

Afternoon All - in light of the recently posted Rebberg movement I thought I would check on the one below - more to do with the case than the actual movement.

The (rather mucky) case appears to be made from silver with fixed lugs and a screw caseback with three circular notches for opening/closing. Does anyone have any information on "ACME STERLING" is it more likely a description (case appears to be silver so sterling) than a trade/company name?

I'm leaning towards the movement and case not being original to one another, mainly due to the dial not appearing to be the correct size for the case (outer part of movement visible) - however they both appear to be from the same period (probably 1920s) so I could be wrong - possibly movement original to the case but not the dial?

Anyway, if anyone can provide any information on the case etc. it would be greatly appreciated.