Hi,
That looks like a 4x5 Crown Graphic, with a 127mm f4.7 Kodak Ektar lens in a Synchro-Compur shutter.
I recommend you use the search feature here, and check
www.graflex.org.
An abundance of info here, and there.
There are two types of ground glass frames ..."backs"... for that model, one accepts a wider range of accessories than the other. A photo of the back will help us determine which one you have.
The " RR" serial number on the lens dates the lens to 1955.
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