I have a couple of hammered-style CI skillets (and 8 inch and a 10 inch) that I am almost positive are unmarked Chicago Hardware Foundry Co. skillets. Does anyone have any idea what age they might be? I think they started producing CI in about 1900, but have no idea when they went out of business. Do they have collectible value? They are great cookers for sure 
I don't have a pic of my exact pieces, but the look just like the couple of photos of CHF skillets on the 'Identifying No-Name Iron' page here:
http://www.castironcollector.com/unmarked.php

I don't have a pic of my exact pieces, but the look just like the couple of photos of CHF skillets on the 'Identifying No-Name Iron' page here:
http://www.castironcollector.com/unmarked.php