2008 Salsa El Santo frame with a Rockshox Monarch RT3 rear shock.

Frame is Medium size

Left on a decent headset (Cane Creek), a Hollowtech II bottom bracket and a seatclamp.

Rear shock is fine. No issues. Rebound settings work as they should, seals seem good. 

100mm travel.

Was a top end bike back in the day with a superlight Scandium frame, setup for 100mm travel each end, aimed at cross country/singletrack.

I most recently had as a 1x11 with a dropper and it was brilliant fun.

Loved riding this bike but time catches up with everyone.

Would make a great little project for someone.  

Couple of images of geometry etc in the pics

It's not meant to handle big stuff & geometry is not slack like modern bikes. 

As long as you know that and don't try and ride it like an enduro bike it's an absolutely ace frame.