My favorite small Spydercos!
The differences are: (Objective)
Handle :Mouse is Aluminum, Navigator is G-10 (New Navigators are Almite (sp?))
Blade Steel; Mouse is VG-10, Navigator is GIN-1
Blade thickness on my Mouse is .115", Navigator is .100"
Blade length; Mouse 1.911", Navigator 2.066"
OAL (open) Mouse 4.932", Navigator 5.274"
OAL (closed) Mouse 3.085 Navigator 3.277"
Thickness at handle not including clip; Mouse .364", Navigator .363"
Clip orientation: Mouse Tip Up, Navigator Tip Down
Clip placement: Mouse Ambidextrous, Navigator right hand only
Top of pocket (clip) to top of knife; Mouse .755", Navigator .045"
(Subjective)
The Mouse is really a mini-skinner with lots of belly, and not much point. The blade shape like the other two Spyderco Wegners is a drop point, although to my eye the Spyder hump makes it look more like a trailing point. The Navigator has a much straighter edge, and a little, but not much more point. The Navigator seems to have a little more handle because of the choke-up position built into the handle-blade juncture.
I really like VG-10 for a blade steel, it takes a tremendous edge, and holds it well. GIN-1 is entirely serviceable, but it isn't VG-10. The belly on the Mouse however makes it more difficult for me to sharpen, where the relatively straight edge on the Navigator sharpens very naturally for me.
I don't have my scale set up, but the Mouse seems about half again as heavy as the Navigator, which adds to the robust feeling of the knife in my hand. I have never abused either knife, but the Mouse looks and feels like it would absorb a lot more hard use than the Navigator. This is not to say that the Navigator is overly delicate, just that the Mouse is extremely tough.
I had rather hoped to field dress a deer with the Mouse , however the "Red Gods" did not smile on me this year. The Mouse should be about perfect for the job, certainly it is no more knife than you would need, but I don't see it as any less than you would need either.
Either knife slips into the watch pocket of a pair of jeans, or would be equally at home in a suit and tie. either knife would make an excellent second carry knife to use around people that are apt to be put off to one extent or another by a full size Wegner, an LCC, or a Benchmade 710.
Mike