That is definitely not a tubular rim.
That fact does not mean that no one ever tried to glue a tubular tire on to it.
I might try a low-pressure wire bead clincher on it if I were emotionally attached to the wheel for some reason - maybe ride it in a parade or something; nothing more than that. For that matter you could put on an unglued tubular and ride in the the parade too. So many options!
Last edited by DiabloScott; 07-10-20 at 09:58 AM.