Hi again,
It does appear like the original paint and it also appears that the design was based on the original Stanley Bedrock planes that had the rounded sides. Many of the older Stanley frogs did not have frog adjustment screws but were simply set up using a trail and error method. It took a little more time in the initial set-up but since the frogs are not adjusted that often it was not a major issue.
Please do post photos of your restorations and try posting some of your offerings in the classified section of the forum.
Have fun.
