Swampy
My book is over 15 years old so I'm sure the value has increased some. It was mfg. in 1960, is 'S' gauge, with knuckle couplers. The value is: good condition, $45 very good, $67 excellent, $90.
Hi:
My book is four years old and it lists the values as $40, $65 and $135. My book indicates this should be a blue plastic engine probably without a reverse unit, although some variations had a two position reverse unit. May have solid or knuckle couplers. No smoke or choo choo.