ry " ▁D af el ▁( 8 ▁January ▁ 1 8 8 9 ▁in ▁P ret oria ▁– ▁ 2 1 ▁August ▁ 1 9 4 7 ) ▁was ▁a ▁South ▁African ▁ath lete ▁who ▁competed ▁in ▁the ▁ 1 9 2 0 ▁Summer ▁Olympics . ▁ ▁He ▁competed ▁for ▁South ▁Africa ▁in ▁the ▁ 1 9 2 0 ▁Games ▁held ▁in ▁Ant werp , ▁Belg ium ▁in ▁the ▁ 4 x 4 0 0 ▁met re ▁relay ▁where ▁he ▁won ▁the ▁silver ▁medal ▁with ▁his ▁team m ates ▁Clar ence ▁Old field , ▁Jack ▁O oster la ak ▁and ▁Be vil ▁Rud d . ▁They ▁completed ▁the ▁race ▁in ▁a ▁time ▁of ▁ 3 ▁minutes ▁and ▁ 2 3 ▁seconds ▁flat . ▁D af el ▁also ▁finished ▁sixth ▁in ▁the ▁ 4 0 0 ▁metres ▁event . ▁In ▁the ▁ 8 0 0 ▁metres ▁competition ▁he ▁was ▁elimin ated ▁in ▁the ▁semi - final s ▁and ▁as ▁member ▁of ▁the ▁South ▁African ▁relay ▁team ▁he ▁was ▁elimin ated ▁in ▁the ▁first ▁round ▁of ▁the ▁ 4 x 1 0 0 ▁met re ▁relay . ▁ ▁External ▁links ▁▁▁ ▁Category : 1 8 8 9 ▁birth s ▁Category : 1 9 4 7 ▁death s ▁Category : S ports people ▁from ▁P ret oria ▁Category : S outh ▁African ▁male ▁spr inter s ▁Category : O lymp ic ▁silver ▁medal ists ▁for ▁South ▁Africa ▁Category : A th let es ▁( track ▁and ▁field ) ▁at ▁the ▁ 1 9 2 0 ▁Summer