Omega speedmaster reduced Cal 3220 question!

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Hello! Hope all is well!

i just wanted to ask a question concerning the speedy reduced and its caliber 3220!

On the movement, next to the markings of 3220A you can see another code, ive seen on the internet the majority of them seems to say DA6 or DA1 etc… but some also has a different longer code something like this: VBF3xxx

i just wanted to know if anyone knew the significance of these codes

attached some pictures from the web for reference!

thanks!!
 
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These are internal manufacturing codes used by Omega. Essentially a date code of s sort. They have no real significance to the end user.