Are you looking for a historical repro or a practical combat/survival knife?
For the latter, I suggest the Fallkniven S-1 or A-1 or the Gryphon M-30A-1, designed by Robert Terzuola, after his own custom combat knives, which he told me were evolved from the M-3 after consultation with mercenary and CIA paramilitary troops working in Central America.
The Gryphon is/was available only through Cutlery Shoppe. They have a site, I believe. If you don't see the Gryphon there, call them to see if any are left. It was/is made with both bright and dull gray satin blades. Without getting up to go check, I think blade steel is ATS-34.
The Fallkniven blades are laminated, with a core steel that's VG-10. They've passed grueling government and university trials in both Sweden and the US, and are authorized for purchase with unit funds for US flight crews, and have a national stock number for the S-1 and F-1. Black-coated blades and Zytel sheaths are optional. They no longer offer Kydex.
www.fallkniven.com They do have US dealers, and prices are usually lower than shown on the site, which are posted in Swedish kroner. I've seen dealers here selling the A-1 for about $150, which is a good deal. The smaller S-1 is normally even less. Similar knives with leather and Duralumin handles that look Randall-ish are offered in their more expensive Northern Lights line.
Finally, if on a tighter budget, look at Buck's Model 119 Special. You can tape the bright aluminum pommel, if need be, to avoid reflection. And SOG's original SEAL 2000 has passed very strenuous US Navy tests before being accepted for SEAL issue. The tang is much wider under the "rubber" handle than you'd think; it is a very strong knife.
Randall fans can buy the Models 1, 5, 14, 15, and 16. Model 18 has a hollow handle and saw teeth. I don't like hollow handles, but this model has seen wide use since the early 1960's and seems to hold up well.
www.randallknives.com
Avoid brass knuckles, which often make a knife illegal to carry, and which restrict your available grasps of the knife. The WW II Ka-Bar and M-3 are much better designs than the WW I knives with brass knucks. I suggest Micarta, Thermorun, or medium-hard Kraton for handles. Buck's phenolic resin is good, too, but a little slick if wet or bloody.