Spectrum Group International is an auctioneer of stamps, coins, arms and armors. The company serves collectors and dealers. It is involved in the business of trading precious metals. The company conducts trading activities through A-Mark Precious Metals, which is a private seller of bullion coins and gold, silver and platinum. Spectrum Group International also manages Bowers and Merena Auctions, which was founded in 1983 and offers services to museums. The company operates Greg Martin Auctions, which specializes in the appraising and auctioning of antique firearms and edged weapons. Spectrum Group International manages companies in the United States, California and Germany.
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