i just finished cleaning up this coin, cleaned up nicely and quicly (about 3 weeks, just 4 "pickin'" sessions).
here's the reverse before...

here now, sorry for crappy photography...


some double striking, christ looks like a cyclops... but the right figure on the reverse doesn't appear to be the virgin, looks like another ruler (maybe saint?)...but no clear nimbus.
I'm not sure what this one is, I would guess that it is an alexius iii..any ideas?