A C grade small bore would be higher.
No photos are provided and I do not know what a "checkered butt plate" is as relates to Parkers. About 20% were made with straight grips, which are preferred by some and generally bring a premium.
However, $15,500 is not an irrational asking price for a CHE 12ga, depending upon the condition, barrels and engraving of the gun. However, if you believe it is not correctly priced, wait and look for another, or perhaps ask the seller, who is likely a PGCA member, why he values the gun as he does.
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