Hi Duke, I have been looking onsite.
This from 'The Cast Iron Collector'.
Lodge Manufacturing Co. - South Pittsburg, TN
1900-1910 "Blacklock"¹ ²
Skillets have outside heat ring
Raised size number on top of handle
Raised molder's mark letter on bottom at 6 o'clock
"Smashed T-shaped" handle reinforcement rib
² Lodge founder Joseph Lodge was a partner in The Blacklock Foundry, predecessor to Lodge Mfg. ...................................Collector groups have attempted, inductively, to fit skillets with these characteristics into the Lodge timeline.
(From 1910 to the early 1930s, Lodge put its name on its products.)
1930s¹
Skillets have inset heat ring with single notch opposite handle at 12 o'clock
Raised size number on top of handle or ¾" high size number at 12 o'clock
Raised small molder's mark letter at 6 o'clock
Some earlier "no-notch" patterns were re-purposed, but otherwise have the same characteristics
All skillet & DO lids have grid of pointed tips for basting drippers, may have raised letter molder's mark on underside
A line of pieces with an unusual "scalloped" heat ring consisting of crescent-shaped segments is believed to be from this time period
It would be helpful if there was a description of the handle characteristic/s. I will keep looking