From the two with the same answer she was first production run in late'71 which would fall into a more proper time frame according to what my Dad had told me however,: having that one gentleman inserting the later date into the conversation kicked over my water pail so to speak... Ha ha ha you are right though, the Factory letter would be the most reliable source as well it may be something my son appreciates having when he inherits her after my passing.. Good call Sir, thank you.
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