Collection of Open Golf Championship American Signed First Day Covers (10) - carrying signatures of the following American winners of The Open - Calcavecchia (Mark, postmarked Troon where he won), Daly (John, postmarked St Andrews where he won) Duval (David), Nicklaus (Jack (3), one postmarked St Andrews where he won), Palmer (Arnold), Sarazen (Gene), Snead (Sam), Watson (Tom, postmarked Turnberry where he won)