Hi all ! I need some help. I often thrift (I'm from South Africa so the brands might be unfamiliar to the UK/US) and today I found a flannel button up that looks quite vintage and the label seems vintage as well (see image attached) - I'm trying to figure out from which year it's from .. On the label it says "REQ C1975" - what does this mean ? Does it mean it was produced in 1975 ? Thanks !!!