So I've just taken delivery of a 5x4 lens that I bought on eBay. The vendor doesn't know too much about it and he's definitely legit. It was given to him by the family of a friend of his who had died.
This is all that it says on the lens which is in a Compur 1 shutter:
Portrait Anastigmat 1:6,3 f=270 1243381
The glass is absolutely pristine and the lens is quite light which suggests to me that it doesn't have many elements. I'm guessing that it's from the '60s or '70s.
I don't think it's a Schneider as the filter size dos not match with any of my regular Schneider lenses. Schneider also told the vendor that they always put their name on their products. Maybe it's a Rodenstock?
Anyway help in identifying this would be much appreciated.