I've always heard that joint called a "sliding dovetail". If you'd
gone with a "stopped sliding dovetail" it wouldn't show at all
from the top - obviously not what you intended.
Handy joint for other applications - shelves, dust panels
and the like - and not that hard to do with a router,
router table and a decent fence. Not so easy to do with
a flush mount drawer. Nice work - though it wouldn't
be my joinery choice in this case - half blind dovetails
are stronger and have a higher Just Showing Off factor.
More pictures of the piece - and maybe some How and
perhaps even some Why?