I own an HG60 (Serial #47GA378) that I inherited several years ago. It runs O.K. and it primarily sees duty pulling a deck mower. It was painted green by a previous owner many, many years ago and needs painting again. I've found orange paint under the green where it has worn through. I've heard that there was a change from orange to green sometime around the end of WWII. Can anyone tell me by referencing the Serial # what color this crawler should be?