I recently purchased this bike and am having trouble identifying the manufacturer. It has J1998 stamped on the rear. Any suggestions gratefully received! Thanks, Chris.
Yes it is a boss for a lamp bracket, most commonly seen on bicycles of the 40s and 50s. I've a handbuilt 1980 frame with one on each fork leg.
I don't know what make of frame (my guess it was sold as a complete bicycle) it is, but think it a mass produced one, not handbuilt (lugs look rather"clunky"), and dates from the 1950s.
If you like the way it rides then it's worth refurbishing.