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I am almost convinced that the American Standard Shield and Globe insignias refer to the Gold content / Warranty on the Case. 

Shield - 20 Years. 

Globe - 25 Years.

Interestingly enough, in the new American Standard Watch Case ads there is a flyer dated 1920, the Case serial number begins with a 0, second numeral is a 9 (?) 

I am basing 1921 for this case on the first digit of the serial number, I could be wrong.