I know this is an old thread, but I had been going through a bunch of old stories, seeing what interested me enough to maybe spend some time on. This was one of those stories. The casting had that old "Style" look to it. The rubbing is great...exceeeept for one thing (actually two):
When Mr Broderick did the rubbing, he left off two words (one at each end of the ingot). That word is "NICKEL". The bar he is holding is a Nickel Babbit Ingot:
The Great Western Smelting & Refining Co. didn't produce precious metal ingots. They made Nickel Babbit Ingots for bearings. Each end should read; XXXX and NICKEL. They are currently going for around $20 for a 48 ounce (Broderick's weighed between 4-5 pounds on a bathroom scale) ingot on ebay.