This is an Invitation to admit 'The Bearer' to the State Apartments, Windsor Castle, on Tuesday 01 October, 1918, between the hours of 11 am and 1 pm.This card is an original invitation from 1918 to attend the State Apartments, Windsor Castle, on 01 October.A white oblong card. By Command of the King an invitation to the State Apartments,Windsor Castle, Tuesday 01 October 1918.On the front of the card a Coat of Arms, the Number 57, Morning, Signature Sandhurst, Lord Chamberlain. On the rear information on gaining access to Windsor Castle. invitation card, windsor castle, 01 october 1918