I have a junction box with a knockout that is 1-5/8" diameter. (it was homebrewed, possibly in 1929).
Would this be suggestive of a particular type of conduit? It will definitely be metal conduit.
Related, I need to make a sharp turn out of that, turning 90 degrees in about 5". Is there a way to do that? I do have access to one side, but it's rather awkward so I'd like to avoid a conduit body.