I would say Lou Tisch's assessment is correct.
The TDB-17' was first introduced by the Clark brothers a couple of years prior your manufacture date.The current owner of The Duck Boat Company, Tony Homer, has a collection of original newsletters, construction and marketing videos, and promotional pieces for the entire TDB line from the original Bristol, Maine production facility. I would guess the original production records were lost in the fire that brought the Maine production efforts to their eventual end.
PM me if you would like to compare notes on what you want to do to update the hull and blind. I am currently-weather cooperating- refurbishing/personalizing a 1996 TDB-17' Classic previously owned by Bill Clark(on this site)-just finished cleaning-up and re-organizing the wiring on the magnetic breaker panel prior adding circuits for a 800gph bilge pump that will discharge into the splash well, and 4 pods of 6" waterproof red LED strips to the cockpit coaming to aid in decoy setting and retrieval in low ambient light conditions. The blind frame tubing is supposed to arrive sometime this week from being anodized a bronze/black color. The connector hardware is powder coated and ready to receive a dab of Loctite on the allen bolts for re-attachment.
One thing I will pass-on: a 3/4" diameter, 72" hardwood dowel inserted inside the long-axis of the cockpit blind frame results in a very sturdy reinforcement.
P.S. I scanned through some of the old TDB Co. newsletters I recieved when I was trying to decide whether to purchase a TDB-17' or 14' back in the late 1980s. The TDB-17' was first produced in 1989.