A racing Duett, now that would be a sight to see.
The rim width is measured across the inside of the edge of the wheel. 1.e. where the tyre bead seats. Unless you have a big pair measuring callipers it's difficult to get any idea of the width. Best to have the tyre off for that. As asked, if there is a part number stamped on the centre on the inside that would help and it should also have the size stamped there too.
If it says Lemmerz - 1538 - 5 1/2" x 15, you do indeed have one of the rare "kronprins" wheels. Hard to find, but someone may have an odd one.
Nice Firenza!
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