It might not have been a foreign company, but a Florida company who bought the rights to produce the boat (if indeed it was a Ray Hunt design, instead of an imitation).
Doing a Florida company search, I came up with this:
Fibra Boats, Inc.
Filed to do business in Florida 08/09/1965.
02/14/1969 changed name to Leisure Industries, Inc.
Status: Inactive.
Converted to Notes 02/14/1969 and 08/22/1970.
Link:
http://www.sunbiz.org/scripts/cordet...s_filing_type=
Click on Name History to see the original Fibra Boats name.
It's a start.