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Pictures, measurements and any other markings you can make out would be helpful. The standard size tank at that time was 72 cu/ft but it could be anything. The other thing you want to look for are breaks plastic coating, if water gets trapped between the coating and the tank you could have a problem.
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here are some pictures. Measurements are about 17.5 long and 6.75 wide it’s got a rounded bottom, so I tried to keep that out of my measurements. 3/4 inch valve though. The plastic coatign does have quite a few cracks in it, however there doesn’t appear to be any surface rust; just dust and dirt from sitting so long
    
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the writtign is very blurry picture. Hard to hold the camera still long enough I guess. However, there is something written under the 4 MR 74+ only thing I can make out is 63+. anyways, pictures are up. If you have any expertise in the area please help me out.
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well, just got back from my local dive shop. No useful information from them. Was told I couldn’t even get a visual inspection of it because it is too old, and woudl "crush" when diving. I’m not quite sure I believe what I was told as steel tanks shoudl last a while, and during my research found that people are still using them today, mainly as a double setup. The one piece of useful information I got was that the thread count on the valve is the old thread count.
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The 63+ tells me its date of manufacturer is 1963. The numbers before that will tell you the month, working pressure. It would look like this "ICC 3AA 2250 ?? 63+" The ?? is the month. Those numbers are on that tank, maybe under the coating. The + allows a 10% over fill. The + rating may not be any good if it hasn’t been done at each hydro.
The tank may be good, but not really practical for you to use. The volume is to small.
Check out my twins 42’s http://divebuddy.com/photo.aspx?PicID=59522&MemID=2165
Maybe this will help.
The Volt valve is a 1963 Pro series 1/2 NPT "K" valve. I hve the parts break drawing and part numbers for that valve
The 72’s are about 25 inches long.
42 cf 6.75 X 18.75 working pressure 1880
50 cf 6.82 X 18.75 working pressure 2250
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Thanks for the info. I found that the tank I was looking at was a 60, and was also told my my grandfather that he has a 72 in the garage that i’m going to try to find and dig out now. My next Question is as far as usabliity; I’d like to have them as back up tanks. Is there a place I can update the valves to a more modern style din/yoke valve and would you recomend checking out another dive shop to see if they will do hydros on old tanks like this?
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