These are the personal WW1 military equipment belongings of the late
Major John Dunwoodie Martin 1883 - 1967, 8th (Service) Battalion (
East Belfast),
Royal Irish Rifles, and 8/9 Battalion Royal Irish Rifles.
He was awarded a
DSO at the battle of the Somme (
1916) and the
Croix de Guerre (
1918), and was appointed a
CBE in
1921.
https://www.ebay.co.uk/itm/WWI-Verners-Pattern-MKVIII-compass-marked-Major-McCallum-DSO-Royal-Irish-Rifles/264155328095?hash=item3d80e26e5f:g:QMQAAOSw4b1cRa~C"WWI Verner's Pattern MKVIII compass marked Major McCallum DSO Royal Irish Rifles""Time left: Time left: 8d 23h (20 Feb, 2019 20:06:15 GMT)"

If you wish to you can read more about him and his career as an officer, sportsman, magistrate, and education authority official, on this post and thread.
http://www.belfastforum.co.uk/index.php/topic,75295.msg2106240.html#msg2106240