Displacement is such a funny number for boats. Other when a boat is measured for IMS or some one design class like the J-22''s there really isn''t a very consistent way to verify the weight of a boat. Some Travelifts have weight read outs but they are not very accurate showing as much as a 1500 lb difference in the weight of my boat between one Travelift and another. The other funny thing was that my boat once showed a roughly 500 lbs of weight gain between the readout at hauling and launch using the same travelift, even though she floated higher when she was launched.
And then there is the matter of whether a boat is measured dead empty (IMS) or in sailing condition (IOR) or half load (the traditional method for cruising boats) or at maximum capacity (as allegedly was popular with some cruising boat builders who were promoting their boats as heavier duty than perhaps they were, and perhaps a bit unethically).
In any event, 10,600 is still a very light weight for a 34 footer of that era.