Quick gauge question

Im referring to an ammeter..or "amp meter" as Ive seen this term used on US forums...

I want to test a 1970s era Dixco ammeter - it has a 60 amp scale - Im not concerned about its calibration, just whether its actually reading current.

If I cant test it with a multi meter without it being connected to a circuit - then is my proposed jury-rigged circuit test suitable?