Hey Lil Possum, glad you like the pics and info. The times don't always reflect the saws true potential. There are many variables that can affect the cutting on these old saws. Some may have the original style semi chisel chain, or even scratcher chain, while the next saw may have been upgraded to a new full chisel. Some of the engines are worn out, but still have enough compression to run. A good example of that is my Super 55/1-81 geardrive. It runs, but is low on compression and has weak seals, so even with new 404 chisel chain, it's times are way behind other similar saws. Then there is operator skill.
Scott