1977 Mercury Outboard Models Where can I find my serial number? 4 [M] 1040207 TH [D] 1001307 TH [R] 1001407 TH [T] 1001207 20 [EL] 1200527 20 [E] 1200507 20 [ML] 1200227 20 [M] 1200207 4.5 [L] 1045227 4.5 [MH] 1045207 40 1402207 1402227 1402507 1402527 50 1500207 1500227 1500507 1500527 7.5 1075207 1075227 7.5 [EL] 1075527 7.5 [E] 1075507 70 1700507 1700527 85 1850507 1850537 85 [L] 1850527 9.8 1110207 1110227 1110507 1110527 115 [ELPT] 1115627 115 [EL] 1115527 150 1150507 150 [ELPT] 1150627 150 [EL] 1150527 150 [XS] 1150537 175 [ELPT] 1175627 175 [EXLPT] 1175647
