Latest addition to the antique brass lens collection: a radial-drive Petzval, most likely American made, most likely pre-1860.
Seen here side-by-side with my oldest lens, a ca. 1840s T. Slater daguerrian lens with the R. Beard Sole Patentee engraving, and a serial number of 108.
I already opened it up to clean the glass and checked - there are no pencil inscriptions on either the front or rear elements.