This appears to be never used with original box Cat No 1665 is crossed out on box and 1657 added in marker so not sure what model it is but is a vintage Heathways single hose two stage regulator Scubair. Never seen one for sale with the original box. The item "VINTAGE HEALTHWAYS SCUBAIR 1665 TWO-STAGE SINGLE HOSE REGULATOR NEW W BOX" is in sale since Monday, April 29, 2019. This item is in the category "Sporting Goods\Water Sports\Scuba & Snorkeling\Regulators".The seller is "southsidesportsinc" and is located in Sarasota, Florida. This item can be shipped worldwide.