This was a company out of Hamburg, NY that operated in the early 80’s. It took me awhile to acquire this lone piece for the “Q” box. I have only come across a handful of 10 oz class examples. Check out this link from Silver Ingot Info, http://silveringotinfo.com/doku.php?id=q:quatre which has a few nice images of another 10 oz variety not commonly found. There is also a picture of an assay paper for a transaction occurring in 1981 which gives a good idea of their operational timeline. I have a Cascade Refining 10 and an IPM (Intermountain Precious Metals) 10 oz that use the exact mold and stamp pattern as this piece below. Check out my blog posts for those two refiners in earlier blogs to compare images. https://vintagepouredbar.com/2020/05/06/10-more-examples-of-c-hallmarks/ is the link for the Cascade Refining and https://vintagepouredbar.com/2020/07/12/intermountain-precious-metals/ is the link for the IPM bar.
Vintage Silver Bars 