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Thank you galamb for all the info on my mariner 30hp really appreciate your quick answer.Tried to get on yesterday to thank you but wouldn't let me on for some reason.Iv'e been trying to get info on this motor for quite a while so you made my day.Yamaha built, for Merc.
689 - Yamaha model that equates to this - just different paint/stickers - Yamaha model 30AM/30AE (manual, electric start) which they built under their own brand between 1979 and 1985.
L - long shaft model (built for a 20" transom)
412020 - serial number part - sold as a 1984 model Mariner
Merc called this the "Mariner Model 30A" - parts are listed as such
If you are sourcing from Yamaha you have a 1984 Model 30AE.