You say the ad I take it. Did you go and look at it? I thought it was a 1975 based on the serial # but I wasn't 100% positive. No, I have not seen seen 550 or 2-44 for that matter any where on it. I currently live in Saginaw township, but the farm is up in Linwood.
30 miles east??? Caro/Cass City area? Thanks for the pic's by the way. That helps me out.