Hey OldCarbX,
You know, I do not know for sure, but often wonder.
And here is why for me...the very first mini bike I ever rode, was a small sears bike that one of my friends had....and to the best of my recollection, it was a small displacement motor, more than likely a 2.5...and I remember it being an orange type color. That would have been in/around 1969 or 1970.
I am thinking it was a Bird Mfg frame....like a Wren, but it was definately branded Sears.
Perhaps some of the experts will chime in on this and let us know.
Thanks