Vintage Goerz Brass Lens 12 Inch Double Anastigmat F:7.7

Vintage lens with a beautiful patina,
no fungus but glass has separations,
Height ca. 5,5 cm
Diameter front circa 6 cm
Diameter rear circa 6 cm
Diameter Flange circa 11,5 cm
Brass lens is engraved with:
 Goerz Patent 12 In Double Anastigmat F:7.7
A very nice collectors item, with the puff of history