Originally Posted by
T.McD.
1950s Benotto fork?
Frankenbike
It doesn't look like the Benotto crown to me: missing the extended "pinching fingers" at the aperture yours exhibits.
Typically a "Frankenbike" describes a hodgepodge build of parts. You have a bare as yet uncredited frame, and a nice one at that.
In order to facilitate identification, descriptive photographs are necessary.
High resolution pictures on a sunny day shot
in the shade against a neutral background will produce the most useful and information laden results.
As you want to identify a builder, focus on the construction details. The way the stays are finished where they connect to the dropout or seat tube cluster. The thinning of the lugs. Nuances.
There are some very adept detectives here; all they need is better evidence.
(Oh, and your finger(s) appear way too clean in the photos.)