Hi Rob, like Jeff I think your seat is very likely genuine, as Ducati definitely used Giuliari seats.
This is the seat I rebuilt for my 200SS, the Giuliari badge is a repro, as mine was beyond reclaim. It is identical to the original badge.
Hope this is of help.

Original frame, sorry I can't locate pictures of the original cover and badge

Rebuilt frame, vertical springs re-plated,I had the base springs made, and made the hooks from stainless welding rod

I bought the new cover, but unfortunately it had the wrong radius at the rear, and would not clear the rear mudguard.
I unpicked the stitches re-cut the backing to the correct radius, and hand stitched it back together.
Fortunately I had to remove sufficient material to lose the original stitch holes.

New badge fitted, identical to original.

Completed seat.