Cal 8800 question

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Hello,

i ve got question. I had a few watches with caliber 8800 and the last I bought was pre owned aqua terra 38mm. I pointed the numbers near the SN. I haven’t got them in my others 8800 calibers. What does it mean ? Is it all legit / prototype ? I ve got all papers and receipts.

Edit: it seems ok, the same is on official website 😁

kind regards
Edited:
 
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It's an internal production code.