This is one of the newer with pistol grip.
If you look at the front of tha saw on the case side where the bar is mounted, but on the front there is a serial nr, stamped.
The saw is intrudused 1962. 90cc, 5,1hp/6400 rpm, weight including all 11,3Kg. It was .404 chain as standard.
Some of thease saws had a muffler that was to set in one of 2 positions, This is for the noise at higher rpm's when cutting branches. I will see if I have it.
This info is from SPA, a goverment company like the patent office, but it only test the items, and approve or not, all sold here is tested.
Mike use the info provided by manufactuer, sometimes the manufactuer is not trouth full, so it is interesting to see these resoults.