Not a coincidence after all, Jock, although our fathers quite obviously shared good taste. My ram pin is Edinburgh hallmarked for 1957 to Shetland Silversmiths. I'm told the firm began in 1953 and is still operating under the name Shetland Jewellry. I'm also told that there is considerable wear on one side of mine and of course that will be the side that's showing in the photo The latter years of the 50s does seem to fit with when my father might have acquired it.