Interesting ! Was not familiar with LONG Model A. Looked it up on Tractor Data and reminds me of a Farmall H. Tractor Data shows Model A built 1948-1949. However it says no Serial # Data ! I have two other sources but came up empty on those so can't help with production data or numbers. My guess is not many produced so may be a rather rare tractor ?
Hopefully we will find someone with more info.