I decided to google 70' Vosper PT Boat and this is what I found:
https://www.google.com/search?q=70%2...iw=880&bih=570
The images shown
Definitely resemble The Uncle Sam II, particularly in the bow area along the rubrail directly ahead of the torpedo tubes. Bruce Heald had the weight and dimensions wrong, leading me to believe that Uncle Sam II was NOT a PT Boat.
Vosper was a British design built under license in the US. Quite a few of them were shipped to Russia under lend lease during/after the war. NB