Terrific finds, both of them! I've always lusted after those sp125s. BlueRider makes a good point regarding the safety features of those saws (nothin'). I do NOT let anyone else use any of my older saws for this reason. On the other hand, if you loan out an SP125, you'll be arrested by the chainsaw police and tried and convicted in chainsaw court.
I'll say that NONE of my big millers has a chainbrake. You'd have to be doing something pretty wrong to get zapped while operating a CSM... but I'm kind of a freak about staying away from the "strike zone" on any chainsaw. Damn things scare the hell out of me!