According to the original literature, the PEARSON 36 was designed with with the "IOR 1 ton rule in mind". An entirely new PEARSON 36 was introduced in 1985. (listed as PEARSON 36-2)
Pearson 1975 36′ Sailboat Great design by Bill Shaw. Fiberglass hull w overall length of 36.58 feet. Hull #96 from production run of 104 built in Portsmouth, Rhode Island.