Type P II (c) Diopters
From St. Marie Graphics.

The components of the Type P IIc Diopter Kit.
(Note: the Type P II kit does not include the Clamp-On Mount and
is intended for those who already own a St. Marie Clamp-On Mount)

A comparison between the Type P II (top) and Type P rear diopters

The Type P II attaches to the Clamp-On Mount's dovetail

The Clamp-On Mount Side View.
(Note: with 3/8" rings the mount can mount a scope) 

Top view of the Clamp-On.

The Type P II can be adjusted for eye relief.

The Type P II pushed all the way forward.

A detailed view of the rear diopter.

The front Diopter.
(Note: the front sight accepts 18mm Aschutz style aperatutres)

Side view of the front sight.

The Type P II and Type PIIc are available from Graf & Sons

Graf & Sons part numbers:
Type P II - STDIOA04 (does not include Clamp-On Mount)
Type P IIc - STDIOA05 (Includes Clamp-On Mount)