Good looking original Chain Steer! Your tractor would be considered a 1948 model, but manufactured in fall, 1947. The first few tractors didn't even have springs; the Harley seat was fixed directly to the seat frame/support. I'd have to measure the springs on my #338, but 2" sounds about right.
I especially like your rear tires! They appear to be the smaller, original 6.00-22 size. The only new replacements I'm aware of are the larger and expensive 7.50-22 size. My 1946 has it's original tires but are getting pretty bad and I'm dreading having to replace them. Are yours original yet that you're aware of?
Edited by oldiron1, July 06, 2017 - 05:05 PM.