I have no idea about the griddle, but the skillet is one or the other.
Marietta Casting Co. - Marietta, PA
Marietta Hollowware and Enameling Co. (M.H.& E.Co.) - Marietta, PA
I've been eyeballing Marietta pots on eBay for a long while.
Here's a skillet that has similar marking to yours, but marked "R & Co" which doesn't match either of the names listed above. ??
Here's one with the EXACT markings as yours, but a No. 8
Marietta Casting Co. Incorporated in 1889
according to this .
The Marietta Casting Company was incorporated April 3, 1889, for the purpose of manufacturing hollowware and other products of iron.
But I don't know if yours is MCC Inc.
Lots of the pots I see for sale are enameled, and marked
MARIETTA.C.Co.
PA
SO, wild guess, yours is Marietta Casting Co. ? Maybe? I'm sure someone will come along with a much closer guess, and maybe a real answer.
I will give you this: Griddle, looks pretty rough, might be a re-cast. It's hard to tell without more photos. Skillet looks real enough, but also, more photos would be nice. Photo of top, and where we can see the pour spout(s)