Not necessarily. There is probably sufficient data to support a letter but it isn't included it the Blue Book Productions Parker Serialization & Identification book, for whatever reason. A letter will probably only tell you the original barrel length and what hardware or sporting goods store ordered your Parker with probably a bunch of other Parkers for inventory. The other elements of configuration of your Parker Trojan you already know.
A research letter will cost you $100 but if you join the PGCA for $40 subsequent research letters will cost you only $40 each and the membership benefits are "priceless".
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