1946 New York Assay Office Gold Ingot. The Assay Office was established in 1854, just after the Gold Rush began, and it was intricately linked to the assaying of California gold that was sent to the east coast. It lasted until 1982. This particular ingot has a vertical layout and shows a round hallmark that is dated 1946, and its fineness is 999.6. Its weight is stamped on one edge as OZS 28.18. Another edge provides the batch number, 120; while another edge states the individual ingot number, 48624. The surfaces are bright gold throughout with no traces of cleaning or tooling.