That is a Norma back, despite the color. I found a picture of it on the Glennview site. It is unlike any F back shown in the Service Manual, which shows all the variations.
A Graflex folding hood works in this back, as Frank mentioned. The insert will also fit in a Graphic Graflok, though with a bit of interference so experiment first.
Rick "who has one just like it" Denney
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