Was this an optional paint scheme? Mine is a 1975 646 with original paint and it is all power yellow. (Frame and tin, etc.) I also have the original brochure for the 600 series from 1975 and those tractors were all painted power yelow as well.
Either way, great looking rig! I hope I can get mine looking that good.:fing32:
I always love mysteries.
I have an original 600 series sales brochure too and it has the date 2/75 on the back page. I had it filed in my binder in the 1976 tab by error. I consulted my 1976 Case GT planning guide and it shows the 600's as being all yellow. So, that was my mistake for including the 1976 model year with my earlier statement but I think that you are mistaken about the year of your 646 TLB. I think that you either have a true 1976 model OR.... your tractor is such a late 1975 model that it got painted the color intended for the 76 models. Let's look at the serial number and see what the chart says.