I don't know what "ALFCO" is but it's a risk buying anything as old as 1943... In all that time, there's a good chance that somebody pumped some water into them. I've been extremely lucky and then I've also been unlucky. I bought a really ugly looking set of USN "Shatterproof" 38s that had the bushings, manifold, bands and harness... Paid $50 and the guy threw in a ScubaPro 109 regulator. Date on the tanks was 1942 I think. When I got them home and looked inside, they looked like brand new. They passed hydro easily and they were even galvanized under the paint. The "UNLUCKY" buy was a set of two single 38s... Also bushing tanks from the 40s which somebody had fixed up with re-plated post valves. These two were rusty inside. I tumbled them and they looked okay. But when I took them in for hydro and visual, one of them was failed for being too pitted with rust. I paid $100 including shipping for these two tanks and ended up with one usable 38... A nice little tank I use often for lake diving BTW. If you figure shipping of tanks must be $25-$50... These are two examples of tanks like you are considering that sold for $50-75 for a set.
I've been lucky far more times than unlucky. I bought my yellow Twin 38 USD set for $100 cash and it included a Dacor Dial a Breath regulator. Insides were like new. I bought my Sportsways Twin 42s for $125 off eBay... A little rusty inside but the Hydro guy cleaned them up and they passed by a wide margin.
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The Freedom and Simplicity of Vintage Equipment and
Vintage Diving Technique are Why I Got Back Into Diving.