2 quick things I notice on the pics:
1) Those bubble look like heat damage (and very hot heat damage). If you don't own an NES, go buy one, and test all of these out first. If you're not sure what you are supposed to see, snap pics and post here. We'll all be happy to help.
2) There have been other test carts with Japanese writing on them, and the best way to find out which it is would be to plug it into a machine. That said, it's definitely a very cool variant, and you'll probably be able to garner a lot more interest in it than the rest.
Value-wise, your grey NES ones are mostly likely worth $100-125, unless the dirty labels are just that and can be safely cleaned up a bit. The yellow carts will possibly garner more assuming they work, and I've seen them regularly command upwards of $200. I'm not as familiar with SNES test carts, but I think the 3 you've got there are in the $125-150 range. Someone feel free to correct me if I'm off.
The Japanese one... ??$$$. NO idea on a price.
Anyways, fantastic find. I would recommend trying your luck at selling them here first rather than ebay. Just be sure to review the hand FAQ at the top of the page before starting a sale thread
. Best of luck, and congrats!