Early 440

[greenman31]

My Dad and I have started working on his newly aquired 440 crawler. I looked up the meaning behind the serial numbers when I discovered that his crawler was number 7 in the series. 440007. I was wondering if there are any known 440's earlier than this one or is this one the oldest known still around?

Our 440 has 500 hours on the hour meter, the tracks look like brand new, and the cylinders lshow now wear. This is our first crawler so it will be fun.