The OP's PPC revolver is a shooter. The value is readily determined by visiting the Clark Custom Guns website. Today someone ordering a base PPC revolver built on a current Model 10 will pay more than $1400 out the door. The OP paid less than 40% for a revolver every bit as "shootable". Would a competitor pay say $1000?
All Clark guns are also collectable, some more than others. Jimmie Clark opened his first shop in Shreveport in 1950. Swagmeister and I have lived in Clark Custom Guns country for several decades. We know that any Clark gun made in Shreveport was personally built by James Clark Sr. The so-called Shreveport marked guns are easily identified and most sought by knowledgeable collectors. Local prices for basic Shreveport 1911 bullseye guns in good to very good condition were at least $1500 a few years ago when Gold Cups in the same condition were $1000 or so. Keithville marked guns are also collectable. But everything else being equal, a collector will choose a Shreveport gun over a Keithville one. I currently own two 45 caliber Shreveport 1911 bullseye guns and one Keithville Custom Combat 1911 in 38 Super. I shoot, I collect.
Princeton guns like the OP's PPC are generally perceived to be current production. Are any also collectable? Well, I'm always looking for another Clark gun. I notice there are two new 1911 bullseye guns in the Clark showroom in Princeton as I write. One is a 38 Super the other is a 9mm. Both are optics ready, both are beautifully finished, and both have been tested in a machine rest targeted at 50 yards. Clearly shooters as each target clearly shows that the first ten shots group within 1". Is either one worth $4000 to a collector?
Dave