Hi Dale
I have just acquired a tug virtually identical to yours. I am finding it very difficult to find out much about its history. The engine number suggests that it is 1938. Since so few look exactly the same I am wondering if there was a common purchaser.
The paint on mine has many layers and the lowest seems to be a grey blue not unlike what appears to be on yours. Be really interested if you have any history at all.
Cheers
Hugh