Bottom left of the frame had crumpled and the glass broken.
OK, here's a few statistics:
22 * 22 mm dark finish deep scoop Obeche moulding - so its effective size is about 15*15mm,
Landscape orientation with the cord stretched tightly between single-screw D-rings,
2.15 mm glass
Double mount
Print glued to undermount
MDF to rear
Contents held in with staples - that is the ones you'd clip a couple of sheets of paper with,
2 off 7mm V-nails to each corner
Now the good bit....
Frame size 1090 * 625 mm
Weight 6.1 Kg.
...and...
9mm pan head screws, one each side.

Strangely, one of the screws had wrenched out of the moulding!

Yes, over a metre wide, 6.1 Kg, tight cord, 9mm screws - one has to stop and ponder what the original framer was thinking - ah! he wasn't!
Apparently it had been hanging for the better part of twenty years before crying 'enough'

So the owner will get a new frame in 38*15mm Ash probably black-waxed and three double-screw D-rings (sides + bottom rail) and shortened 16mm screws. The cord will have some slack and do two laps of the 3 D-rings.
Cheers,
John.