I am translating a document that has the identification numbers 2017-976 written in letters this way: two thousand seventeen-nine hundred seventy-six. I was doubting about placing the dash like that between seventeen and nine. Should I write "dash" instead? What would be a proper way of writing said numbers with the dash in between? And how to write them with other symbols (+, x, @, etc)?
It is a legal document and the document identification number is, say, FRG-2017-976, but in the original document they both write it like this in parenthesis and spelled out in letters.