What the heck are these?
 

Been all over the Interwebs, and can find a lot of Signal Oil PCL issues, but not these. Test issues? Can't find any finished cards that looked like these.

https://live.staticflickr.com/65535/...b69004d4_b.jpg467302364_1296801984789072_7156687329235367108_n by Philip Golden, on Flickr

Thanks! No idea if they are worth anything.

I can't really see them being worth under $100 each for a name like Libke and maybe double that for a name like Zernial. But who knows you never see them