One of the local port-heads could best respond to this (or you could try posting this question on www.theportforum.com), but this bottle seems odd for the claimed age. The fill is low, but the label just doesn't look that aged to me. The lack of age for a ruby is likely a good sign, but the low ullage looks bad. Either way, this is not a wine of value if that's what you were wondering about (even vintage ports appreciate in value very slowly).
Just give it a try and report back!