Going to need pictures on this one as there are a huge number of European single shots of this general description.
The Crown over E/LG over Star is a Belgian proof for definitive proof in use since 1893.
The Oblisk is also a Belgian inspectors mark for final proof in use since 1852.
I can't find a reference to the Crown over JA&C, but given the two other Belgian marks I would guess that it is a Belgian makers mark and is similar to a number of other Belgian makers marks that are letters under a crown.

As I said, pictures needed.......

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Dean
SWCA #680 SWHF #446