The earlier P's are supposed to be T337GP's, but they are not all registered that way. The designation on the registration is whatever the person filling out the form uses, and I do not believe there is any edit on that by the FAA. Many T337G's are registered, and to my knowledge, there is no such airplane, as the turbo, non-pressurized airplanes did not start getting built again until the H model series.
Kevin
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