There was a blue model McCulloch made in 10 series listed on a reference site but I can't remember the model.
With saws there definitely seems to be a Chevy vs ford mentality, I don't have too much brand loyalty all I know is what has given me fits and whats worked well , so far McCulloch is at the top of my list .
I've been quick to judge certain saws in the past but most of that has changed with experience, except for anything with a computer in it , I will never sacrifice freedom from a screwdriver for convenience.
There is some discussion if the blue 7-10 power head may have been this one used by Target. Mark posted this pic of a Belgian cutoff saw in 2016 on another site.