WW1 British Artillery Sighting Scope MK4 Dated 1916

WW1 British Artillery Sighting Scope MK4 Dated 1916, used for sighting 13 and 18 pounders throughout WW1, complete with following markings “W.Watson & Son Ltd London, 1916 No 5647, Sighting Tel No 4 Mark III with War Department Stamp.  The scope measures 430mm in length, complete with leather caps to protect lenses that are often missing in great condition.