This appears to be a vintage Linfield F.C. home football shirt from the late 1970s and early 1980s.  Key Features Team: Linfield Football Club, a professional club based in Belfast, Northern Ireland. Era: This specific design, featuring the white "winged" collar, was primarily worn between 1978 and 1982. Manufacturer: The shirt is made by Umbro, as indicated by the double-diamond logo on the chest. Details: It is notable for being the first Linfield shirt to feature an embroidered Windsor Castle badge, which is the club's crest.