When is a breakfast table like a writing desk? (Question re: antique desk)

I came across this antique (or maybe slightly newer) table/desk thing. I don’t even know what to call it. It’s a breakfast-table-ish sized table with a drawer-like slide-out thing that unfolds in half on an angle to make a felt covered, slanted writing desk.

Can anyone tell me what it is called? What it might be worth? (If anything.)

Additional details: I’ve been told (by someone who claims to know) that it’s a late 1800s “travel desk”–something a cavalry officer might have. The slide-out section has a flip-up bit with storage for paper and such underneath.

A picture is worth a thousand desks. It sounds like a ship’s desk, similar to one I have from that era.