NYMark wording
Undated
Jacques Kreisler & Co.
New York NY, USA
c.1922: 333 Fifth Ave., New York | c.1934: 136 W. 52nd St. New York | c.1943 – c.1950: Jacques Kreisler Mfg. Corp 9015 Bergenline Ave. North Bergen, NJ
Read the stamp
333 gold stamp
A 333 gold stamp may sit beside ITALY origin wording. GF denotes a bonded gold layer; GP describes gold plating over another metal.
333, 8K and neighbouring stamps
8K or 333 is an 8-karat gold standard. It contains one third gold, with other metals making up the rest of the alloy. Common combinations include 8K 333 and 333 ITALY. Look inside a ring shank or on a chain clasp or end tag.
What to check next
Keep suffixes attached to the number: 8K GF describes a gold-filled layer and 8K GP a plated layer. A plain 333 fineness mark describes the gold alloy. On a chain, inspect the links as well as the clasp because a replacement clasp can carry its own stamp.