Johnson 115 Year?

[gkm24]

I seem to remember that this may be difficult. The tag with the model No is missing from my Johnson 115. The serial No on the Aluminium plug is: Co400119.
Anyone have any idea what year it is or how I may identify it?
It is fitted with Trim and Tilt other than that I don't know how to tell its age.

 

[guyjg]

http://www.autorepairmanuals.biz/site/573683/page/599222

 

[bill_w]

He doesn't have a model number!!!

 

[racerone]

If cowling is original then a picture will get near instant identification.