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Re: Men's wristwatch 707/1 [message #16137 is a reply to message #16135] Thu, 17 February 2022 22:14 Go to previous messageGo to previous message
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Registered: May 2019
Location: Cincinnati
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It's Wadsworth nomenclature, a reference to their internal grades. These names changed over time, and I suspect the lacking ones are transitional. I also think it is a clue to which case number line they are in, before all switched into the 5MM. At some point in the late 20's these letters may have disappeared.

I've seen...
A = the old "Amer" / "American Made" line
R = reinforced
E = extra gold (replaces R, I think)
P = permanent (I think phased out in the early 1920s)
 
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