Second stage ID

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I'm not sure about the Scubapro models, but on most of my older US Divers second stages the first 2 digits are the year of manufacture. Of course, we are talking '77 and '78 on those ones. I don't know if that still stands true for the newer models.
 
I have a ton of old Scubapro and Aqualung second stages laying around. How do I find out what models they are?
Send me pictures and I can tell you what they are.
 
https://www.shearwater.com/products/swift/

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