Also, one thing interesting to note is that the keyboard in this machine is from an early IIe.[1] One of two possible ways this could have happened - someone used the (much nicer, IMHO) keyboard from an early IIe to replace the one in there, or when the original owner upgraded from the early rev IIe, they bought the replacement top case too. It was available as a part as part of the upgrade process through Apple, since the new IIgs base pan won't fit on the early IIe top casing.
For a while, many years ago, when the IIgs was somewhat current, at least one reseller had their own "kits" to upgrade IIe's to IIgses using ROM1 motherboards bought as Apple spare parts. They made their own bottom housings out of simple folded/punched aluminum and sold them with the kit. The resulting machine would not have an identifying sticker on the bottom or the logo on the case lid, and the inexpensive unpainted aluminum base pan would be easy to spot. The holes weren't *quite* right, but it was good enough to work for most people, and it was cheaper than the real kit.
-Ian
[1] The earliest Apple IIe's had the keyboard with the white letters, and rough textured keytops. The switches were slightly different feeling. Later IIe's had smoother keytops with black letters. The casing of the early IIe was made of a thicker foam-type plastic, like the II+ case. It had the same giant-velcro latching system to hold the top on - the plastic was not flexible. Bottom pan was aluminum. Later IIe's are the most common, having thinner, slightly flexible plastic cases, with the snap on latch mechanism in the back. Bottom pan was steel.
-Ian
