Well about I can tell you offhand.....I'm no expert on Parkers, my shotgun expertise is on the other end of the scale, Crescent Shotguns....
But.....you're Parker was made in late 1923, so it's a real
Parker, made before the Remington takeover in 1934. It appears to have fluid steel barrels, not damascus. The lack of engraving would indicate that it's either a Trojan Model, or a VH Model.
Overall, I'd guesstimate it's in about 60%-70% condition.
BUT.....here's a website with TONS
of info about Parkers that might help you identify your beautiful shogtgun: http://www.parkergun.org/
They also have a Discussion Forum there.
When you've identified which model it is, c'mon back and I can give you the Blue Book value on it.