The OAK Collection exhibition - for 'One of A Kind' - comprises 160 'best of the best' vintage and contemporary museum quality watches, among which are unrepeatable special orders, ultra-rare limited editions, the most valuable examples of their type and the largest number of Patek Philippe pieces once owned by the celebrated collector Henry Graves Jnr. to now be held in private hands. Every watch is in truly perfect condition, with the majority of examples being new or virtually unworn. All are serviced on a regular basis by a highly experienced watch maker whose working life is dedicated to maintaining the collection which, having been patiently gathered and never previously revealed, could fairly be described as one of the watch world's 'best kept secrets’. The OAK Collection travelling exhibition opens at the Design Museum, 224-238 Kensington High St, London W8 6AG on May 19 and runs until May 25.