Puckerings has dated this piece to the 1860s.
The set of weights are also engraved. The two pans are inset with panels of Malachite as is the front.

I am surprised such a spectacular pair is unmarked, but they look remarkably like Sampson Mordan scales.
As grand and showy as they come in excellent condition. Impressive in size, measuring 12 1/2" x 7 1/8" and standing 8 1/2" tall.
Item ID: 35316
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Puckerings has dated this piece to the 1860s.
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