' s ▁most ▁expensive ▁gold ▁coin , ▁The ▁ 1 9 3 3 ▁Double ▁E agle , ▁in ▁London . ▁The ▁exhibition ▁was ▁part ▁of ▁a ▁European ▁tour ▁organ ised ▁by ▁the ▁Sam ler h uset ▁Group , ▁and ▁it ▁marked ▁the ▁first ▁time ▁the ▁Smith son ian ▁National ▁Museum ▁had ▁sent ▁an ▁object ▁from ▁its ▁num ism atic ▁collection ▁on ▁tour ▁in ▁Europe . ▁ ▁In ▁ 2 0 1 6 , ▁The ▁London ▁M int ▁Office ▁hosted ▁the ▁UK ▁exhibition ▁of ▁the ▁Flow ing ▁H air ▁D ollar , ▁the ▁world ' s ▁most ▁expensive ▁coin ▁ever , ▁s elling ▁for ▁$ 1 0 ▁million ▁at ▁au ction ▁in ▁ 2 0 1 3 . ▁The ▁coin ▁was ▁on ▁show ▁at ▁La ▁Gall eria ▁in ▁central ▁London . ▁Due ▁to ▁the ▁coin ' s ▁value , ▁The ▁London ▁M int ▁Office ▁were ▁forced ▁to ▁implement ▁a ▁complicated ▁log ist ical ▁operation ▁to ▁ensure ▁the ▁coin ▁remained ▁safe ▁throughout ▁its ▁British ▁leg ▁of ▁its ▁European ▁tour . ▁ ▁Events ▁ ▁To ▁support ▁its ▁Battle ▁of ▁Water lo o ▁campaign ▁in ▁ 2 0 1 5 , ▁The ▁London ▁M int ▁Office ▁organ ised ▁a ▁special ▁event ▁in ▁London ▁where ▁a ▁mem orial ▁to ▁those ▁who ▁fell ▁at ▁Water lo o ▁was ▁un ve iled ▁by ▁the ▁current ▁Duke ▁of ▁Well ington ▁at ▁Water lo o ▁station . ▁The ▁event ▁was ▁also ▁attended ▁by ▁broad c aster ▁Peter ▁Snow , ▁over se as ▁amb ass adors ▁and ▁descend ants ▁of ▁original ▁soldiers ▁from