1965 #444 5c Christmas tied by Quebec slogan (13 X) on cover to insurance company.
A rare COMMERCIAL first day cover (FDC). Philatelic FDCs are easily obtainable. A specialist collector can show difficulty of acquisition with rare cachets, hand painted cachets, OR a commercial FDC. So fill that obvious hole in your collection and buy a commercial FDC.
Better yet, start a challenging FDC collection focussing on ONLY commercial examples. See my other items in stock.