Quote Originally Posted by Two23 View Post
I agree this is a standard 5x7 Korona that has been modified. I have one with both 4x5 and 5x7 backs. Koronas can be roughly dated by the company name on the bottom of the front standard. Mine dates to about 1925.


Kent in SD
The decal on the front (it's a gold decal, not a metal plate) says "Gundlach Manhattan Optical Co. Rochester, N.Y." Does that narrow the date range at all?