B3 on my 2824-2 ETA

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Just want to know what B3 stands for that all here a pic. Could it be the grade?
IMG_2368.jpg
 
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B3? You sank my battleship! 😜

I'd like to know the answer too.
 
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Bueno, Bonito y Barato (Good, Pretty, and Cheap) 😉
 
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I see it mentioned, but is there a definition of what it means in relation to the parts or Standard, Elaboré, etc?
 
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Who know probable companys grid out these marks and sell them like that need to ask my watch guy in Chicago next time I go out there.
I see it mentioned, but is there a definition of what it means in relation to the parts or Standard, Elaboré, etc?