Fine and rare Patek Philippe 18K gold Observatory Chronometer with Class A
observatory certificate circa 1897.
Fine 20 jewel nickel "Extra" movement with dual serial numbers, wolf's tooth
winding, unusual precision regulator, and possibly an early form of Guillaume balance.
White enamel dial with blued steel hands. Plain polish case with elaborate
monogram. With Observatory Bulletin and certificate from Patek Philippe.
