William Adams & Co. Salamander Safe Brass badge

There is always a market for safeplates like this but along with austerity times , prices have dropped.
Your plate measures 8 3/4" by 5 1/2" and is not super rare but will probably get $150 on ebay

William Adams & Company, Boston, MA. (1850's to at least the mid 1860's)
Successors to Adams, Hammond & Company, (1840's to early 1850's) "Smiths & Machinists", manufacturers and sole proprietors of "Wilders Patent Salamander Safe.

The "Patent" was originally issued to Daniel Fitzgerald (#3117), on June 1, 1843. Fitzgerald assigned the patent to Enos Wilder to manufacture the safes, which is why it was known as the "Wilder Patent". Enos Wilder left the patent to his heir, Benjamine G. Wilder. In 1844 Silas Herring who was an agent selling safes for Wilder, made an agreement to manufacture safes under the patent and to pay Wilder 1 cent per pound for the right to be the exclusive manufacturer and seller of Wilder's Patented Salamander Safes. Several patent infringment lawsuits were filed against various manufacturers who were making these same safes without authorization.
As the Wilder Patent was due to expire in 1852, Silas Herring patented a new method and began making and selling his own safes. It would have been about this time that Adams, Hammond & Company (and later William Adams & Company) obtained the rights to continue making these safes.