Any paperwork to cerify the Max. Working Pressure? Also, all compressor tanks must have a pressure safety valve, does this tank?
Unless you have the paperwork or it has a data plate stating the pressure rating, you just might be buying a bomb. You only need to overpressurize it once to cause a catastophic failure. It might not be rated for 150psi.... maybe 5 psi. you won;t know unless you have the information.
I would not buy it unless it has paperwork or data plate that states the specs.