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• MacGregor Numismatists Online
• MacMillan Numismatic Collection, John H.
• Magna Graecia Coins
• Malakoff & Company
• Malloy, Alex G Inc
• Malter Galleries Inc
• Marcel's Coin Collection
• MarcOne Numismatics
• Marrello, Ray - Antique Currency, LLC - U.S. Currency   - Supporter of ILNA
• Maryland State Numismatic Association
• Mazzi, Michele's Currency Page
• McBride, Art Rare Coins
• McKinn's Coins
• Metals Used in Coins & Medals
• Mexican Numismatics
• Michigan State Numismatic Society
• Military Coins
• Millennium Fiji
• Miller Coins, Wayne
• Frank Milward
• Mind Your Business
• Minneapolis Gold, Silver & Numismatic Services
• Mintmark.com
• Mint Products.com
• Mint State Coins
• MJP Numismatics
• Model City Coin Club
• Monex
• Money-Changers
• Monnaie de Paris
• Montana Numismatics
• Monter, P R
• Montgomery County Coin Club (MD)
• Mostly Crowns
• Mount Vernon Numismatic Society
• Munzen Ritter
• Museo Cordici di Erice
• Mynthandel, Norrtelje
• Münzsammlung