With these slant TM ERIEs you will find many different variants. The pic you show is a good example. The small pic is a large TM while the other is a medium TM. The number eights differ the placement of the the letter at the p/n differs, the quotes, and probably the handles if you have full pic of that. I have them with quotes and without quotes, some have numbers on handle some do not.
No matter how marked or variation of skillet they are a quality skillet. The demand must be fairly high from watching them sell on eBay. Blue book has circa 1906- 1912.
So if looking to put a matching set of these together then you have much to look for.
These were made sizes #1 thru 14. Numbers 1,2, 13, 14, being high $$$ and HTF. The #1 will set you back around $4000..
That's all I can think of off the top of my head, hope some of the rambling helps.... Ed :)