The Duchess is a series in 4 reel sizes - 3 trout and 1 spey/salmon size. Hardy is calling the Duchess one of its "Heritage" reels (along with the St. George Trout and St. George Hot Spur Salmon, Wide Spool Perfect and Bougle).
It has a four pillar frame and two single screw lifeguards. The spool spool appears to have an exposed rim (think the Hardy Marquis). There's a classic Hardy 3 screw latch cover and finger lever spool release. From the looks of the photo of the back plate, the check mechanism looks like the Marquis' also (no photo of the check plate shown). There's a classic Hardy rim mounted regulator screw. Sizes are 2-3/4" - 3 wt., 3" - 5 wt., 3-1/4" - 6 wt. and 4" - 11 wt. No widths given for any of the sizes.
In the 3 small sizes, it looks to cover the old Trout Marquis reels. It always seemed odd to me that when Hardy reintroduced the Marquis, it was only in the Salmon sizes.
Its a good looking reel and I hope they make it available from US dealers.