Davis Boye has been making excellent knives for many years, I have a Dendric steel folder with an eagle wing cast into it as the thumb opening detail that I picked up when he was still in Davenport, CA and I love it!
Just a few things, Myerchin has moved their plant from Japan to China. The recent interruption in their supply was due to that shift. They claim to be using German steel now, for what that's worth.
The new "Camillus" is also a Chinese operation, however Colonial is still making the Mil Spec 1757 folder with a marlin spike and 'jiggered' brown plastic handle in Warren, RI. These knives meet the same military specifications as the old Camillus and from what I can tell holding them side by side it is a comparable knife. The spike is a little more pointy, that's my only observation.
From what I've come to learn, fixed blade knives seem to be preferred by those on larger vessels, as well as maritime professionals, while folders are more convenient on smaller sailing vessels. On my website I've found a market for dual fixed-blade and marlin-spike sheaths.
When working on the deck of the 19th century scow schooner, which I volunteer on, I like a separate spike to deal with the (what seems like) miles of line. However, I can understand how a smaller boat sailor might not want the hassle of a full belt rig, multiple tools and lanyards &tc that can snag on stuff, and would feel more comfortable with a folder in his (or her) pocket that has a spike on it to deal with the unexpected stubborn knot. It's better to have something on you than a fancy rig in the cabin.
BTW, old Camillus and Ka-Bar knives do pop up on ebay from time to time, expect to pay $60-$80 for one in good shape, and around $120+ for a Case.
I hope you find something your friend will use for many years.
--jack