Hi Al:
Thanks for posting those great photos of your Uncle and his tractor.
One of the greatest strengths of this forum is that we are constantly adding to the photographic record from private sources. All the books written in the immediate post war years and even up to the 1960's relied on offical photos and many of them appeared so often they became icons.
For us heavy metal fans photos like yours are refreshing. I suspect it was winter or early spring when the pictures were taken as the rad screens are at 'half staff'.
Mike