I discovered this smooth-unmarked bottom, number 3 stamped on top of handle with 2 dots underneath handle CI in an old family storage building a week ago and started researching the processes of restoring this skillet and one other I found with it. I chose to first remove the substantial amount of rust with a 2 day vinegar bath followed by a 2 day electrolysis method. Prior to the restoring process, I could not identify any markings on the 5" skillet. After completion of the restoration methods mentioned, I saw a number 3 on the top of the handle and then tested a fried egg after four seasoning steps. These are the picture of the restored CI and thank you for any input.
https://www.dropbox.com/s/il8et881cslqsyf/Skillet 1.jpg?dl=0
https://www.dropbox.com/s/hrjpukzocky5kdo/Skillet 2.jpg?dl=0
https://www.dropbox.com/s/fkbpg0p4vasmf1d/Skillet 3.jpg?dl=0
https://www.dropbox.com/s/52w9ox402enqdmg/Skillet 4.jpg?dl=0
https://www.dropbox.com/s/il8et881cslqsyf/Skillet 1.jpg?dl=0
https://www.dropbox.com/s/hrjpukzocky5kdo/Skillet 2.jpg?dl=0
https://www.dropbox.com/s/fkbpg0p4vasmf1d/Skillet 3.jpg?dl=0
https://www.dropbox.com/s/52w9ox402enqdmg/Skillet 4.jpg?dl=0