We have many variants without known mintage and older coin issues where only the cumulative mintage of all years or a range of years is known. I don't know how difficult to implement this would be or if other refs would be into smth. like this.
But it could look something like this:
In most catalogs it would be incl. above but because of auto sorting I don't think that the position would always fit for the wording. Maybe in an excel export the mintage containing such a cross reference could be denoted with an asterix (*) or smth.
