This is a all beige mouse with a long 9 pin connector.
On the connector is
the number KPT-0044J-03 and on the mouse is model A2M4015.
Going off the model number, it would seem to be an Apple part. If it is
all the same color beige (button isn't a slightly darker color), then I
would think it is the original Apple II mouse (which would fit with the
model number designator A2M for Apple 2 Mouse). I believe these were used
with the Apple IIe (pre IIe Platinum).
-chris
<http://www.mythtech.net>