https://www.dfwairparts.com/28nscsp110-vintage-warbird-aircraft-pin
Vintage Warbird Aircraft Pin. P/N 28NS/CSP110.
28NS/CSP110, Vintage Warbird Aircraft Pin - Nos, Vintage Warbird Aircraft Tapered Pin. P/N 28NS/CSP110 or 28NS/CSP110/140. NSN: 5315-21-817-3373.
vintagewarbirdaircraftpin