Yep, thay was my Dad's saw for 8 foot rounds, and it was a monster.
Loud as all hell too, and one of the things I blamed for his deafness later in his life.
That saw didn't have a chain brake or even an auto recoil starter (you kept the starter rope in your back pocket. :D
The teeth on the chain were about 3/4 of an inch long and 1/2 high and had the depth guides cut down half way.
I remember because it was my job to sharpen the saws, and change worn out chains and bars.