USN Mk1 knives.
Sweet little knives with a bazillion variants. Aluminum, bakelite, wood, and God only knows what other materials were used for their pommels. These are aluminum and bakelite. I have a wood one somewhere but could not find it today.
Some have fairly dainty, thin, blades and others have pretty beefy blades. These two are beefy. I have a thin one that was in shit state, so it is being redone soon. Some have leather sheaths, but most have the fiberglass as shown here. The Mk1 was my first love in Military blades.