Yes, 1922 it is! It will soon be a Centenary for the Handbook.
And for those who collect back numbers we can sell you almost any year back to 1936, when the cover was changed to stiff card instead of the original thin pink paper. The earlier ones are much less common, and it is a pity the Council tried to save pennies in 1922. Mind you the Journal also had a very thin paper cover until 1936 when it too was redesigned.
The Handbook for many years was without a pictorial cover. Some opposition was encountered in adding one some two decades ago, but so long as the pink colour of the cover was retained, the Council seemed happy to support the change.