Did decide to run the serial number through the decoder...

"Manufactured in: F => Fremont, California, USA

Year of production: 1986

Week of production: 47

Production number: BWX => 13767

Modell ID: M5011 => Macintosh SE FDHD

Your Macintosh SE FDHD was the 13767th Mac manufactured during the 47th week of 1986 in Fremont, California, USA."

http://myoldmac.net/FAQ/Mac-Serialnumber-decoder-e.php

Of course, as we know, pre-SuperDrive/FDHD M5011's were just marked Macintosh SE 800k, HD20SC on the back. Or just Macintosh SE in some cases.

-J