Hello.
Your Veyrat mark is shown here:
http://www.925-1000.com/Ffrench_makers_V.html" onclick="window.open(this.href);return false;
In 1840 he was succeeded by his son Adolphe who registered a mark in 1840, struck off in 1849.
Veyrat Fils (at the same address) registered a mark in October of 1849.
I'm wondering if Adolphe continued to use the same mark as his father?
Not sure what your piece was used for.
Pat.