That first cut was red oak lol [emoji12][emoji106]
You got me there your right I just saw the other logs first and was thinking it was soft..... ya that saw does pretty good no doubt it will cut with a modern saw.
And it's old ! Did you say 1971 ? That's getting up there in age. Obviously those saws were well built. My stihl 031 is I think a 1976 something like that it's dead on reliable. Slow and steady. It never bogs down but the rpm and chain speed are so slow it cuts slower than what I'm used too.