A couple of thoughts:
The retaining ring is definitely missing. See the deep groove around the crystal? A fat o-ring is supposed to sit in the groove and the ring presses down to compress the o-ring and squeeze the crystal. So your ring is still attached to the bezel, they both popped off and hit the floor and rolled off under your toolbox or something.
Replacement crystals are readily available from SternKreuz and G&S. I believe Offshore has them at WatchBitz. O. Frei has them but why subject yourself to the abuse?
http://www.sternkreuz.com/accordion/assets/Sternkreuz_Gesamtkatalog%20G22.pdf
http://www.ofrei.com/page419.html
The G&S PA 462-20A may be perfect, at 30.3mm and should be a (perhaps too-) tight fit inside your Clarks ring.
If it's too tight, carefully sand down the crystal's perimeter and/or sand down the inside face of your ring just a little. Use some lubricant like Vaseline and press that ring in place.
Niiiiiiiiiiiiiiiiiice. Go Stihl, or go home.
044 here, 32" Sugihara solid bar with roller tip, .68 gauge full chisel skip-tooth chain, with the "Super" kit and the "Magnum" kit.
The boys call it The Fear Of God
Whoop whoop! The power is still out, lots of fresh new snow just above the house, lots of trees down.... firewood everywhere!
It's like pennies from heaven.
.........and wait till you see what people here have created from scratch when that unobtainable part was simply.....unobtainable.
Do a search and see if you can find the thread where one of our members created a PloProf case from a block of steel.
Can't do that, smoke comes down the chimney and fills the house.
Now the power is out and it looks like a war zone with power transformers blowing, making huge blue flashes in the rain clouds down the mountain.
There's fresh snow on Suicide Peak right above me.
We've got a gnarly early winter storm tonight, with sustained winds ~100mph.
Hang onto your hats, it's going to get ugly! The barometer is down to 944mb and dropping ... during hurricane Isaac is was around 968mb.
YOWZA!!!
Truer words were never spoken.
It can seem like we have all the time in the world when life is easy, and each day doesn't mean a lot.
But when life takes a turn, each day becomes incredibly valuable.
After the storm, that's still a good way to approach life.