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Looks like it is massively out of hydro (was due in May of 1998, unless there are other Hydro markings not in the picture). Are they Aluminum (hard to tell from picture) or steel. If they are steel, there would be much less problem,... if Aluminum, it may be very difficult to get filled. There is a lot of controversy about Pre- 1990 Aluminum cylinders (Luxfer & Walter Kidde). There were some that were made of a bad alloy & have the potential to rupture. A lot of shops will not fill them because of this, that is if they can even pass hydro. If they are steel,.... well, I’ve seen some older than this come in & pass hydro.
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Oops didn’t see the info with the last hydro date (Was not in the picture). If last hydro was 2012, then you have about another year or so (depending on month).
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c:\my files\diving\Tank markings
3AA - Steel
2250 - Service Pressure (PSI)
SN - 199133
1st inspection/MFR symbol - 4 N 70+ (+ = test + 10% pressure)
1st inspection - 4 - Month 70 - year
+ - may be filled will 10% extra pressure
Inspected by symbol - N (Norris) /
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Little help for OleCab.;)
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Thanks. That’s exactly what I needed to know. Looks like it’s a Norris to. Now all I have to do is get a new valve for it and it’s ready to use.
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Thanks Eric_R, I just couldn’t neither of the image/photo things to work.
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Got a pair of those myself, made a nice set of small dubs with a SP 232 bar din-K maniflod and HM 2 1/2" bands.
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lerpy - 12/29/2015 11:57 AM 
Little side note, depending if you ever go to Canada to dive with your tanks, it appears there is no TC (Transport Canada) number which is commonly on tanks now.
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