I inherited a pale grey seal similar in design to Sandy's but probably made in the early 1960s. I passed it on in the family and the last time I saw it it looked like somebody had been blowing smoke through it for years. I suspect the environment in which it has been kept (a true, old-fashioned billiards room) changed the colour over the years. Pretty nasty, anyway, and it has now been put away in the kist for another generation to find. And wonder about.