Orkney Image Library

Besides this kilted Highlander, only two other war memorials in Orkney are in the form of sculptures. They are the female figure at Stromness, and the Angel at Kirkwall. The remainder are "relatively plain and unadorned obelisks or columns".
Source: Orkney View, Issue 52 - an article by Jon Davies.

my grandfather, pipe major james cumming, of kirkwall city pipe band played the pipes at the unvieling of this memorial. I don't know the date.

It was unveiled and dedicated on Sunday 21st August, 1921. The statue was based on a photograph of Private Robert McLaughlin of the Black Watch, who was killed on the Somme in 1915. Source: "For Freedom & Honour" by G.L. Esson

The sculptor of the statue was Alexander Carrick, whose mother came from the Hope. The photo and its story are on the website on his life and career at this link.

I believe my grandfather (John Norquay) was one of the masons who built the stonework on the monument.There is a memorial at Loch Awe with the same figure as the "Hope" memorial.