All matching numbers, 70% or better bluing, minimal water discoloration on the buttstock, minimal hobnail boot dents on the butt, securely attached buttplate (the screws loosen after mutiple owners take them on and off looking for soldier ID tags), minimal or no pitting on the barrel band, rear sight should move easily, no rust, single clear cartouche on the butt. All that said, the worst buttstocks aren't all that hard to resurrect - they'll show their use but it's all 'character.'
It's almost unheard of for a Swiss to have a poor bore as they never used corrosive ammo. Check the muzzle's crown.
Desirable features when you encounter them - walnut rather than beech, tiger stripes are seen occ., sling in half useable shape (not a great design for actually shooting but historically correct), bayonet (rare!), brass muzzle cap, stripper clips (like a stiff cardboard), possibly a cleaning kit. All these items can be picked up in the aftermarket.
Widener's had/has some at $195, condition not really well described. This guy has several around low 200s.
http://www.allans-armory.com/aaresult.php?PageId=31
Nice examples are climbing to $300 plus from about $175 last summer and $100-125 in years previous. Nice guns, I find the rear sight 'V' notch a little small but my eyes are getting old. You can get a handy little tool from a guy on Gunbroker (heavy steel collar with an adjustable setscrew) to adjust windage on the front sight. No 'smithing, removable scope mounts are available from Brownell's (St. Marie Products). Diopter sights can also be found for mucho $$. Several sources intermittently have Prvi ammo for a reasonable price and it's an easy cartridge (308 bullets) to reload (Ammunition to Go, Wideners, Grafs). GP-11 s the original issue ammo - very accurate but Berdan primed. Prvi is good brass, boxer primed.
/Bryan
ETA: - some have been refinished - that's a personal decision dependent upon the quality of the job, how the cartouche survived and your preferences about 'as-issued' vs after finish.