After conducting research on the origins of these ingots, I believe they are from E.D. Marshall Jewelers out of Scottsdale, AZ, who have been in business since 1971 and still have a chain of stores in AZ to date. It’s the only E.D. Marshall I could find that fits the profile, so I’m placing a high likelihood that it’s them. For those that collect bars from this sought after hallmark, you will know that the Sandoval Jewelers ingots in 5 and 10 oz are identical. I’m convinced that E.D. Marshall made these for Sandoval, which was likely a related operation in AZ. The premiums on both refiners are very high. The 5 oz E.D. Marshall is about as scarce as it gets, along with the Sandoval 5 oz.
Vintage Silver Bars 