Some details on the Garcia history.
Vietnam era Hackman of Finland Survival Knives were designed by Ken Warner and Pete Dickey and were made during the late 1960s and early 1970s. Only a few thousand were made by Hackman in Finland with a 1/4 blade. Later Garcia in Brazil worked with them to produce the knife with a 3/16 blade. The Hackman survival knife was intended for private sale to military personnel bound for Vietnam, but the Garcias were more widely sold.
The Randall Model 18 had made the hollow handle sawback popular with the troops in Vietnam, but Randall could not keep up with demand. Enter Warner and Dickey working with Hackman. It featured a watertight hollow handle and a massive 1/4 thick stainless-steel blade. From Ken Warner's book "The Practical Book of Knives" circa 1975, Chapter 7-The Sharp Pry Bar. I was responsible for the shape and the grind of the blade and the overall configuration.
In essence, it has a hollow stainless-steel handle, closed watertight by a large threaded pommel. The space inside is nearly the size of two 12-gauge shotshells, which means it will hold matches, pills, another little knife, hooks and line-a whole raft of stuff that could come in handy. Pete Dickey went ahead and had packed a miniature kit that went into the sheath's pocket and had a lot of that gear in it. They put all they could think of into the knife to make it do as many jobs as possible for a soldier who, suddenly, has to do it all with a knife. It is heavy and tough enough to chop wood or meat or bone.
It is wide enough to dig with if you need a hole in a hurry. The saw edge is designed to get its users poles without making loud noises.
Its steel will not rust, and it's hard, so it holds an edge. If you had to hurt someone with it, it is equal to that job. It will slice very nicely and is, after you get used to it, handy for dressing out game. It has a couple of holes in the modest double guard, and by lashing through those to a pole seated in the hollow handle, a rather impressive spear would result.