A couple of things get me about this, and I maybe wrong is that a 70's release poster? or maybe 80's, as there is no way that is 1925... It's an unusual poster, but has no relation to Lon's Phantom bar his name being on it. Mel could do that with any poster on here.
Would I buy it, maybe but my top price would be £30, and I'm a huge fan of Lon Snr, and his version of the Phantom... Pennies is what it's worth.