[mintacular]

Those are called T206 "White Borders" Hands down the most popular pre-war tobacco cards. Those look to be in decent GD/VG shape and probably worth between 20-30 each (they are all commons). Ones in terrible/creased or worse shape tend to run between 10-20/ea. Most common backs are Piedmont, Sweet Caporal, Polar Bear and a few others. There are many slightly tougher backs like Cycle, Sovereign, Tolstoi, etc. and then much scarcer backs like Drum, Hindu (Red and Brown), Broadleaf, Carolina Brights, and many more. These back premiums can x10 x20+ the value of any said card. I am leaving out many details but I'm sure others will chime in with a more detailed thread regarding back scarcity, other brands.