Unfortunately the serial number of your GHE is in the range of a missing stock book (or order book - not certain which) and it is very likely a dead end. I had a CHE Parker Double Trap 230760 which is certainly in the same book and I could not get a letter. I don't know if it is in the right period to ask Griffin & Howe if they have any info on your Parker. Perhaps Bill Murphy or Dave Noreen or Don Kaas will come on and let you know if there is any hope in the G&H suggestion.
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