Some of my really old Dead Tree ™ books had SAN or ISBN's without the check digit (9 chars long) ( I think there may have been confusion at the time, that the check digit was not part of the ISBN to be printed)
I backed in
the check digit by trying [0-9X] until Calibre gave me a Green
Note: (USA publishers) space or dash were the only separators I saw. never mixed. never interrupted with other characters.