1 0 0 th ▁meeting ▁( in ▁ 1 9 5 9 ) ▁and ▁the ▁ 2 5 0 th ▁meeting ▁( in ▁ 1 9 7 1 ) ▁of ▁the ▁London ▁Num ism atic ▁Society . ▁▁ 1 9 5 7 ▁C NA ▁Ann ual ▁Convention ▁ ▁The ▁fourth ▁C NA ▁Convention ▁was ▁held ▁in ▁Hamilton , ▁Ontario ▁on ▁August ▁ 3 0 ▁and ▁ 3 1 , ▁ 1 9 5 7 . ▁The ▁Hamilton ▁Co in ▁Club ▁hosted ▁the ▁event . ▁The ▁guest ▁speaker ▁was ▁J . D . ▁Fer g us on , ▁and ▁rec ount ed ▁“ Mem ories ▁of ▁Fif ty ▁Years ▁in ▁Num ism at ics .” ▁The ▁ob verse ▁of ▁the ▁medal ▁displays ▁the ▁host ▁city ' s ▁coat ▁of ▁arms . ▁ ▁NOT E : ▁Two ▁Ster ling ▁Silver ▁versions ▁were ▁created ▁as ▁awards . ▁They ▁had ▁an ▁ant ique ▁finish ▁with ▁the ▁words ▁B IR KS / ST ER L ING ▁im pressed ▁on ▁the ▁edge . ▁It ▁we ighed ▁ 2 1 . 7   gram s , ▁was ▁spe cially ▁c ased , ▁and ▁one ▁was ▁presented ▁to ▁J . D . ▁Fer g us on . ▁▁ 1 9 5 8 ▁C NA ▁Ann ual ▁Convention ▁ ▁The ▁fifth ▁C NA ▁Convention ▁was ▁held ▁in ▁Ott awa , ▁Ontario ▁from ▁September ▁ 4 ▁to ▁ 6 , ▁ 1 9 5 8 . ▁The ▁Ott awa ▁Co in ▁Club ▁hosted ▁the ▁event . ▁The ▁guest ▁speaker ▁was ▁Harold ▁Don ▁Allen