590660 Simplicity 44 Zero Turn Riding Mower (Used). 590660 Simplicity 44 Zero Turn Residential Riding Mower CONDITION- This is a used mower in great overall condition. See pictures for details. IDENTIFICATIONBrand: Simplicity Model#: 590660Serial#: 2013069112Engine: Briggs & Stratton 24HPEngine Model#: 44M777Engine Serial#: 080422YG14437DOM: 2009 ADDITIONAL DETAILS – 276 Hours of Operation – Hydrostatic Drive System – 44 Deck. 590660 Simplicity 44 Zero Turn Residential Riding Mower. CONDITION – This is a uséd mower in great overall condition. IDENTIFICATION Brand: Simplicity Model#: 590660 Serial#. Briggs & Stratton 24HP. Engine Model#: 44M777 Engine Serial#: 080422YG14437 DOM: 2009. 276 Hours of Operation. Hydrostatic Drive System. Sorry, our items are NOT available for pick-up. No additional information at this time. You might also like. 30-157 Oregon Air Filter. Yard Machines 31D-140-352 Single Stage 21” Snow Blower. MTD 317E640F382 Two Stage 26 Snowblower w/ Tecumseh 8HP Engine. Generac Stator Assembly And Wiring 0H63620191 From Generac 0058420 Generator.