The tan captains chairs with adjustable armrests do exist.  Johns in
westminster VT had a set last summer, and like I said, they are the only
ones that I have seen.  I should have purchased them but wasn't in a
position to clean them up, deal with the one missing armrest etc. easily
since I was travelling.

The missing armrest may have been in the van somewhere, but I didn't look
beyond the front area.

Jonathan Poole