This is a vintage collection of 4 (four) different slide rules in size and measures. They are all new old stock items and they are specially for collectors. PLEASE, DO NOT HESITATE ASKING US IF YOU HAVE ANY QUESTIONS.The item "Slide Rule Collection of 4 Pieces, New Old Stock (Ref. #6022)" is in sale since Friday, December 09, 2016. This item is in the category "Collectibles\Pens & Writing Instruments\Desktop Items\Other Desktop Collectibles". The seller is "penpartsstore" and is located in Miami, Florida. This item can be shipped worldwide.