Marler Type R21
The top of the frame with a dent above "D" or a mark above "OS".
Marler Type R21 will demonstrate Fluorescent Ink when viewed under UV light.Plates Used: 101-102
Earliest reported use: Sep 10, 1916
The top of the frame with a dent above "D" or a mark above "OS".
Marler Type R21 will demonstrate Fluorescent Ink when viewed under UV light.Plates Used: 101-102
Earliest reported use: Sep 10, 1916