One of the eternal questions for lovers of old photographs is "how do we know when they were taken?" Our sepia relics predate digital date-stamping by a century or more, and pencilled captions tend to be few and far between. So we are lovers of the inconsequential, ephemeral detectives, collectors of clues. When was Henry Baynton in "The Melting Pot" at the Royal Lyceum Theatre? When was the Vagabond King on at the Edinburgh Empire? (The answer, of course, is 1929 .... or maybe 1928 - photo dating is an uncertain art). This week on Sepia Saturday we are celebrating photo-dating. This, however, is Sepia Saturday which inevitably means we are celebrating old posters on walls, gable ends, custard and coffee - or any other interpretation you care to squeeze out of the theme image. Simply post your posts on or around whatever date it is and add a link to the list below. And take a look at what is to come around the gable end.