Bill Stein began his professional career in collectables in 1979 with the stamp auction firm Harmers of San Francisco, after a few years employed by Harmers. Bill began his own stamp business, where he Bought, Sold & Appraised Stamp Collections.. We will Buy or Consign,Stamp and Cover Collections,Art,Coins & Currencies,Rare Books,Furniture,Classical to Modern. By Appointment Only!