HO Scale 4-6-2 Steam Engine #5299 / Really Clean, Looks Like it's Never Been Run

Made in Slovenia, bottom is marked Mehano 1701-A and also RSO Atest Z-75157

***Check out the pictures, the wheels and drive train look perfectly clean and new, I can't find any flaws.   I  did  a  test  and  the  motor  runs  strong  and  the  headlight  lights up.  Rear has a pin instead of a regular coupler, so probably originally came with a coal tender, but there was no other car with it when I purchased it at an estate sale.