I hope to list them all eventually but, in the meantime, here are some examples in chronological order:
1877, 14th June
Original design image from National Archives: BT 43/58/310935
1877, 30th July
Original design image from National Archives: BT 43/58/312417
1880, 13th October
These three designs ( BT 43/58/356547, 356548 and 356549) share the same date as the diamond mark on the chair pictured above. There are no other designs registered with that date so we must conclude that the chair is a free variant of one of them.
1881, 24th February
These images share the date with the mark on the chair pictured (thanks to Laura of Orpington.) They are BT 43/58/368897 and 368898.