Our boat doesn't really have space for a permanently mounted Admiral's chair at the main helm (without losing dinette/table space.)
During our survey, our PO mentioned to me that if I get the boat, I should make sure to get a folding captain's chair for her - that's what he had for his Admiral.
When we took delivery, we found that he'd put their chair on the boat for us!
And the Admiral
, she likes it! (When she's not in the helm seat...)
It's a folding tall captain's or director's chair, and has a little foot rest to it, I think probably this one...
Here's a photo of it stowed next to the stairs down into the aft cabin: