ACTII, Do you now own this boat or just interested in her? Have you sailed her? If you read between the *&$# words on the SA site some of the comments might be correct or at least considered, 29' is small for a ketch
, don't expect much in performance in light air. Could be a diamond in the rough though.
As for the build history
FLZ is a state issued HIN # to a home builder
or maybe a small yard. FL was full of small builders in the 70s and 80s. Also in 1980 foreign built boats may not of had HIN #s and FL issued a HIN so the owner could register it. Maybe with the FL registration
you could search for POs and contact them? Any original equipment
may give a clue to an USA or Euro build, sailmaker
make, fasteners metric or US, labels in English
or something else?