Dug this out of the back of the safe today. (Sorry, no pics.)
Northern Arms Company Gold Sierra HW77. Full length, 25mm cylinder (serial begins with 10). Venom-esque silencer, nickel (or chrome?) plated underlever, gold plated back block, nice walnut tyrolean stock with contrasting rosewood grip cap and fore-end. And ventilated pad. I guess the stock is probably by Custom Stocks of Sheffield, but it is unlike any CS stock I have seen or used.
Bought late 90s when you could pick up "custom" springers fairly cheap as owners went PCP. Last time I fired it a few years ago it was smooth, very accurate and felt like it had been fettled, but may just have been a good HW77. Have not yet taken it apart for fear if of marring the gold trigger block.
I believe from threads on here that NAC was run by a guy called Bob Presley and has since folded.
So, any ideas how many were made? Were they tuned or just a cosmetic job? And, not that I am selling, thoughts on value? It is in I think 99% condition.