Corduroyboy is right.....they are SS7's.
These are actually great canti levers and are suprisingly powerful. I have a pair myself that I used for many years.
Yes, I remember them being good ones which is why I am using them on my E3 retro build with XT or XTR cantis, whichever ones I can source.
I suppose a lot of it is having the brake cantis and levers set up right. We take for granted the power in discs and v brakes, but in the end if you end up locking up the wheels, due to the surface being loose, there's not much point in having mega brake power.
No matter how bad it gets... it could always be worse.
1996 Orange E3 - A601
1996 Orange P7 - A602
Repairs: All the various bikes of my 4 children and various nephews and sons of friends, etc. - Just give me the cape and call me "Bicycle Repair-Man"...