Fine and scarce heavy 18K gold Waltham 20/S vibrating hairspring antique pocket watch circa 1865. The case with wear to the engine turning. White enamel dial with blued steel hands. Gilt 3/4 plate 19 jewel movement with screwed jewel settings.
This watch is fitted with a jeweled pivoted vibrating hairspring stud to achieve isochronous performance without the use of a Breguet overcoil.
