Old solid back seagulls

What models specifically?

See here for a list of all Seagull models and specs. acousticguitarcabin.boards.net/thread/1170/seagull-acoustic-guitar-archive

All artist models have had solid backs, but before 2006 the sides were laminated.

The Duet models also had solid back & laminated sides (1998-99).

There were a handful of S6 models in the late 80's thru the late 90's that had solid backs. CW Blackburst, Blackwood HG, Maple, CW Mahogany & CW Flame Maple. Good luck finding one of those. I actually have a CW Mahogany waiting for a few repairs, including a couple of cracks in the solid back.

Any pointers on identifying a duet?