Asher Hamilton built four of my guns.
Sadly, I only have three now.
Cosmetically, his guns were very good, but his engineering was where he really shined.
Since 1981, I have only replaced 1 mainspring, and flint locktimes are faster than I have seen from any other builder.
I photographed his catalog in 1982 (see attached)
The Fowler, Emmitsburg, Tennessee, & Halfstock Hawken were my guns at the time.
He sold his equipment in the late 1980s, and 1994 was the last time I heard from him.
His former wife said he died a few years ago, but People Search says he still lives in the Portland OR area.
Hope this helps.