Plate Assay Act, 1783

Every mark or punch constructed so as to indent the image,

the relieved image thin, sharp, &c.

X. And be it further enacted, That every mark or punch to be used after the said first day of June, one thousand seven hundred and eighty four, by any goldsmith in pursuance of this act, shall be so constructed as (instead of causing the image made by the impression of such mark or punch to be raised) to cause the image made by such mark or punch to be indented in the gold marked therewith, to prevent the said image being defaced or injured in the finishing of the work, and that the relieved image upon every mark or punch so to be used by any goldsmith as aforesaid, shall be made thin, sharp, and shallow, with a flat stop or shoulder to the said mark or punch to prevent the injuring of any gold manufacture marked therewith.