C.E.Riese Berlin Brass 300mm f=6,8 doppel-anastigmat lens

On auction , this brass lens made by : C.E. Riese Berlin.Serial No: 8149. The lens is in good condition , glass looks reasonable clear , with signs of old age , more then 100 years old .
Hight : 6cm.
Diam front : 5,4 cm.
Thread size : 5,47 cm
Diafragma from 6.8 --44.

Please see all pictures as they are part of the description. 

Note that : Import duties, taxes and charges, are not included in the item price or shipping charges. These charges are the buyer's responsibility.