so, er, there's been a new clock launched. 'A new Timepiece for the Railway'. Apparently the gimmick is that the arrows start out at the 12 o'clock position, meet up at the 6 o'clock position in 30 seconds, then meet again at 12 o'clock in another 30 seconds; so of course one revolution per minute.
https://www.networkrail.co.uk/stories/a-new-timepiece-for-the-railway/ 