There have been six editions of the Pitcairn Postcard Magazine, published between 1998 and 2010. The Pitcairn Postcard Catalogue was originally a small black and white printed edition. For such a specialised publication, the move into full colour, and also the increase in the actual amount of information included, made it far too expensive to produce as a printed volume so it is now being produced in pdf format.
Four postcards showing a collision involving the New Zealand Shipping Company's Remuera which occurred in 1922 are now on the HGK website. Could they have been taken by Henry Keyse? I don't know, what do you think?