A very rare late 19th century Waltham 16 size model 1872 crystal plate pocket watch

American Waltham Watch Co., Waltham, Mass., a very rare model 1872 crystal plate pocket watch, 16 size, 17 jewels, stem wind and lever set movement with transparent rock crystal top plate and balance cock, the bottom plate gilded and with ornate damascening, with lever escapement, cut bimetallic balance with gold screws, gold wheel train, damascened, polished steel winding wheels with engraved gold washers and Fogg tadpole micrometric regulator in an 18 karat, yellow gold, hinged back and bezel display case, and arabic numeral, outer red 5-minute markers, double sunk white enamel dial signed "A.W.W. Co" in Old English font above "Waltham, Mass.", with blued steel Breguet style hands, serial #10, with Waltham purple silk and velvet lined mahogany box
Condition Report: CASE: Not original to movement; Dings; Very fine scratches on outer surface of case; Crystals with minor marks and fine scratches; Precious metal content tested. DIAL: Not original to movement. HANDS: Minor oxide, tip of minute. MOVEMENT PLATES: Winding wheels with minor specks and one small spot of oxide; Setting lever with minor oxide; Balance cock screw replaced; Repaired break to balance cock at jewel/ stud; Some loss of material on the underside resulting from the break; Winding wheel washers inconsistent with those used on other extant examples of this model. MOVEMENT FUNCTION: Running order (winds, sets and ticks). Box with minor marks and scratches. The movement was part of the Wing Collection, sold by Jones & Horan in 2018, and fitted with the current case and dial following the auction.ACCESSORIES: Box, circa 1890