If I recall correctly, The guardian (I had a camoflage one in black-coated tool steel w/ cordura sheath) was the baby - about 6-7 inches OAL, the guardian II was a similar design, cast metal handle slim blade approx 1/8" thick, but longer blade similar to the mark I (OAL approx 9"), but w/o the same type of guard, and the handle was thinner - it was very slim & concealable - I once saw a set of the guardian & guardian II back in the early 80's, complete w/ the shoulder harness for the guardian II, and a little cordura sheath for the guardian, that was a multi-positional rig that used a velcro patch that allowed the sheath to be positioned in various ways on a platform. Both of the knives were retained in their sheathes by two plastic flanges that engaged the small guards at either side of the handle. The guardian backup is the new version of the guardian w/ a plastic sheath & rubber inserts in the handle - can't remember if the whole handle is synthetic. the sheath has a steel belt clip that is reversible for inverted carry, and has an adjustable tension retention system.
The Mark II was offered in a 5 degree cant w/ a "cat's tongue" or "paw" finish - I can't recall, but the Cutlery Shoppe used to advertise them in their catalogs.
[This message has been edited by Flotsam (edited 09-30-2000).]