I am restoring a 16 foot '69 wriedt stinger...
they were made in norwalk i believe
from what I can tell from the one i am working on, they were layed up pretty well. It's in pretty good shape for being a 37 year old family lake boat that has taken a good beating in its time.
you can check out its restore progress here: http://www.socaljetboats.com/index.php/topic,11.0.html