ORMOLU AND GREEN ONYX BOUDOIR CLOCK SET S MARTI 1880s??

Im really not sure the origin or value of this Antique Onyx Clock circa 1880's??  I hope that someone can identify it for me and tell me its value.

Antique Green Onyx Anniversary Clock

underneath reads:  747 AE 2851

brass face plate reads:    19. 9. 99.

             Lumm 25 jabrigen jubilaium

                Hern W. A. Suggel

           jeviudmet

            1874   1899

              von

        seimen  Kollegon

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I saw another one online just like it and this is what I believe this Antique Clock is but Im really not sure.

Ormolu and Green Onyx Boudoir Clock
by Samuel Marti

~ French - Circa 1880 ~

A stunning original, antique French boudoir clock. It is made of the most beautifully variegated, specimen green onyx. This is mounted with finely modelled ormolu (fine gilded brass / bronze) in the Louis XVI style. To the top of the clock is an onyx urn with ormolu handles and finial.  

The dial is enamel on copper, decorated with delicate floral swags between the numbers. The hands are finely fretted gilt brass.