Help Identifying a Huge Griddle

[Kyle S.]

Hello Everyone. I picked this griddle up with a large lot of cast iron and cannot ID it. The only marking is a raised D, at least it looks like a D to me, molders mark on the back. It is a monster at 23.5 inches by 12.5 inches. Any info would really help.
Kyle

 

[Doug D.]

Handles consistent with Lodge. 1930s catalog gives dims of a #10 as 12 x 23.5.

 

[Kyle S.]

Have you ever seen that makers mark? Are these rare? I certainly have never seen one this size. I gave 20 for it so I feel I got a good deal either way.
Kyle