Well, six large over a period of years is a bit different than, say, Zeke saying "it can be your's today for six large". Looks a LOT nicer than any keeper's gun I've ever seen, nice engraving and wood.
I priced new English boxlocks from different outfits, including William Powell, and an upstart that builds a false sideplate boxlock-if you got your own stock dimensions, and a set of sound damascus tubes, you did OK.
The last article that Terry Weiand did for Shooting Sportsman on the basket case Hussey, he was pretty quiet on what it all cost (the total was up near 18 large in the first article).
Enjoy it. You could have had six large in Janus, and you wouldn't have a nice gun to use now.

Best,
Ted