262x and 264x'es are pretty different. See
http://www.digidome.nl/hewlett_packard.htm
Here's a good search... 44 results:
http://search.yahoo.com/search?p=%2B%22hewlett+packard%22%2B2647a
and some of us can supply further pictures from our collections.
Does yours do graphics? Have tape drives?
What makes the one you're looking for distinct?
John A.