What is this ?

[Blacklord]

Found this auction on eBay Germany - http://cgi.ebay.com.au/Commodore-Umbau-in-Metallgehaeuse_W0QQitemZ270059857401QQihZ017QQcategoryZ3544QQrdZ1QQcmdZViewItem

Modified ? Prototype ?

[xlar54]

It looks like some kind of C64C wannabe.  I remember back in the day there were alot of case "mod" kits that allowed you to convert your breadbox C64 to a C64C lookalike.  Most were pretty cheap looking.  I loved the C64C though.  Not sure why they did it - other than to maybe lean folks towards the 128.  Commodore made that mistake alot. Too many machines (including peripherals) with too many variations.

[Mangelore]

Interesting. Looks like a Plus 4 with a C16 keyboard.

xlar54, I have one of those C64 cases that allows you to convert a C64 to a C64C. It was made by Micro Accessories in SA and looks like the botton one on this page.
//www.reliveretro.com/collection/c64/index.html

The plastic moulding on the back has two extra holes. One is labelled RESET and the other is D-DOS which I'm guessing was for a DolphinDOS ROM on/off switch???