What's the coverage of these lenses ?

Just acuired 3 Hexanon GR 11's via the auction site and the 300mm is surplus to my requirements. However it does have far greater coverage than my other 3 LF 300mm/12" lenses.

A Google search on Hexanon GR 11's gives valuable information regarding the 150mm f9's, luckily mine does cover 10"x8" with a little room for slight movements, but I can find nothing about the 210mm or 300mm versions.

Before I post it for sale, here in the classified section, I'd appreciate honest opinions of its potential coverage for ULF.