The small metals company Denron Ltd. was based in Oak Creek, Wisconsin. A lot of companies would hire factories to make ingots for them. Cripple Creek Refining in Colorado made this ingot, most likely in the 1970s or before. Cripple Creek Mining District, which was in Teller County, Colorado, was a big name in the mining world. This form (3.43in x 1.97in) is a perfect match for the only known 20 oz class Cripple Creek, Colorado ingot. The weight and quality stamping fonts are also a perfect match. Only "Denron" is stamped on this ingot. There are only two known bars in this weight class, making this a very hard bar to get.