That frame dates from the 1970's and I would bet it was imported by Cycle Imports in Cornish, Maine. They were a Roberts importer / distributor, along with other bike parts and framebuilding supplies from Reynolds and Columbus.
The number 14 stamped into the Track Ends is probably just a painters reference # to keep the correct fork matched with the correct frame. Very necessary when dealing with multiple frames from multiple builders.
Roberts of that era were very nice frames. If it were mine I would strip that awful, porous clear powdercoat and get it "properly" painted and decalled. I think Franklin Frames in Ohio do a great job for pretty reasonable prices.
Enjoy your new bike !