The numbers about which you are asking are various inspector/fitting type marks, reflecting who did what in the manufacturing process. Factory letter: it depends on what your purpose is. If you have any serious collector goals, including establishing a valid value for future sale or some such purpose, I am sure that everyone here who has a clue about such will tell you a letter is needed. I am not one of those people - not a collector, not interested in such data as it has no importance to me.
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NHI, 10-8.
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