What is the year of my 4 HP Evinrude Model E4RETB, S/N 08966530?

There is a model 60452 listed under 60hp, 1964year. Not sure what the S means, but in the 60's they were 2 cycle. I don't think 4 cycle came out until the 80's. Evinrude Outboard Motor Model Numbers

INTRODUCES = 1234567890. ES =1990
The last two characters of the model number (that make sense) are your year.

E50PL4SS year 2000
the 55 is probably SS

To get the year of Johnson and Evinrude outboards use the word "INTRODUCES". Each letter corresponds to "1234567890" respectfully. It's best to check with a model year reference book, but this motor's model number contains "CC" which would indicate it's a '88.

An evinrude dealer may be able to help you

1978 It is in the model on an Evinrude. 6804.... 6 HP.....1978

1970 4 Hp with that info.

The Manual Store also has some useful boat motor model year lookup data:
Boat Motor Model Year Lookup Guide

Here is a site that allows you to search the manual by topic.

http://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1981&hp=4&model=E4BRCICI


Here is a site that you can purchase a manual.
http://www.marineengine.com/parts/johnson-evinrude-manuals.php?Year=1981&HP=4&Model=4BRCIC