Is a flat bottom better than corrugated? Since this plane is slightly shorter than the metallic jack plane, a parallel naming was taken from the asses donkies.
It is an early version with the loop adjuster that works off the cap screw instead of the pin type adjuster.
Carpenters and educators used to daub their planes and other tools in coloured paint so that they can be easily spotted in the wrong toolbox.
Buy it, you will not be sorry! Cleaned up and discovered cracks in the sole coming out of the corners of the mouth.