RM Sotheby’s (formerly RM Auctions) is the world's largest auction house for investment-quality automobiles. With over three decades of experience in the collector car industry, RM's vertically integrated range of services, from restoration to private treaty sales, auctions, estate planning and financial services, coupled with an expert team of car specialists and an international footprint, provide an unsurpassed level of service to the global collector car market.
Mecum Auctions is based in the Midwest United States and known for their great American classic and muscle cars. They have the lowest buyers commission of the major auction companies. Recently they set a world record with almost 2000 collector cars crossing the block in one day in Indianapolis, Indiana.