Other How would one value this rare PCP?

I bought this piece of airgun history almost a decade ago. It was the most affordable way to step up from my Diana Stormrider, at a time when money was tight but accuracy was a priority.
This is the Calibr Hooligun, a single shot predecessor to the Kalibrgun Cricket. Almost all Information on this rifle has dissolved into the abyss of internet archives. I have just a few printed documents and schematics that could add historical context.
I guess the question is... Does this thing carry ANY value? It shows signs of its age but functions perfectly.

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I don’t think there is any collector value in that rifle. Nor any early “modern” PCPs. No offense but early Gen pcps don’t gain much value unless they’re around the Girandoni’s age. Take for example the Daystate Huntsman MK1. A fine rifle that’s also single shot. Can be had for $400-$600. FWIW, used Kalibrgun Cricket Gen 1’s go for $600-$750.