Seems to be a very nice 413F in really great condition. But here is my question. I thought these things had dates stamped on the bottom of the tanks. There is nothing stamped on the bottom of this tank. Where else can the date be.
I does not appear to have been used much, and it looks like it was always stored inside, so I have no idea from appearance how old it might be. The only issue I have found so far is that is does not seem to pump up, so I guess it needs a pump rebuild. I have never done one of those before, but from all I have read here, it doesn't seem to difficult.
Here are a couple more pics.