What Is It? Give me your SWAG...

[T.C.]

I found this on the Northern California coast, north of Crescent City. It appears to be some kind of shell. Waddayathink?? How about it, Cyber Dan, you live over in that neck of the woods...and Oregon Viking.

 

[jewelerguy]

kinda looks like a coral encrusted clam shell made into an ashtray, but now broken (?)

 

[Anduril]

kinda looks like a coral encrusted clam shell made into an ashtray, but now broken (?)

Or, instead of being broken, maybe the clam had a bad nicotine habit?

Wait, I got it... those gag exploding cigarettes?