Bill et al.,
#120 has an original set of line drawings from the factory, one of the nice profile and sail plan and another with three "X-ray" views (dorsal, lateral and anterior) of the hull. The former has a small "7" circled in the bottom right corner, and the latter has an "8" in the same manner.
Are these in any way rare or valuable? If so, I'd be far more comfortable turning them over to someone or an institution that could see to it that they are properly cared for rather than letting them sit aboard and slowly dissolve in the salt air. Alternatively, I'd frame the profile/sailplan one and store the other in a safe place at my parents' home.
Jeremy