Vintage GA & MASSCO (Mine and Smelter Supply Co.) 999 silver ingot 10 troy oz, made using vintage marking device(s), DC-143

Original Golden Analytical ("GA") 10-troy-oz 999 Silver bar (1970s-1990s vintage, made in Colorado), with additions in 2024.
Front: "GA" logo, vintage/antique 13mm round MASSCO ("The Mine & Smelter Supply Company" / "Denver, Salt Lake City, El Paso, New York").
GA serial number "D50131". (DC) serial number "143".
Back text added: "GOLDEN / ANALYTICAL"; "MASSCO -- DENVER"; "COLORADO SILVER".

Production details for this series of vintage-style ingots are documented on this page:
Ingots with vintage/antique marking devices applied.
Every bar in this category has a serial number starting at 001 in the order that the bars were produced. For identification purposes, the serial numbers are preceded by a 3mm round DC circle logo punch. Every bar in this group is unique in some way, either by weight, design, layout, and/or fabrication technique. A particular marking device may be used for only one impression or possibly up to about a dozen impressions.

These bars are, in some respects, similar to Dennis England ingots that were produced circa 2000. However, these Daniel Carr ingots utilize vintage/antique marking devices whereas Dennis England bars had newly-fabricated marking devices. Dennis England bars have recently been selling for over $1,000 even for one or two ounce silver.