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Same as Jetwind. Kransco was acquired by Snark sometime in the 70's, I forget exactly when.I think you have a hull from a Super Scamper, built by Kransco. see additional pictures and measurements at Shorty Pen's boat guide: Super Scamper By Kransco ShortyPen Sailboat Guide
same basic hull shape, and the same strange rudder mount as your photo.