both in white metal, of rectangular form, with incremental marker and slides, the first, a rear sight for a "Long" Enfield rifle, and the other a rear sight for a Springfield M1903 rifle

Note: Similary to lot 2 in this auction, this lot relates to Dr. Walter Halliburton MacDonald.

MacDonald was born in Lochaber, Inverness, 1858. He went to East Africa in 1889 in the service of the British Imperial East Africa Company, working as the Principal Medical Officer. He served in this role until around 1900.

Much can be gleaned (although some conflicting) from the online source below,
https://www.europeansineastafrica.co.uk/_site/custom/database/?a=viewIndividual&pid=2&person=1337

MacDonald was present in the operations in Uganda during 1897-98 and was Medical Officer of the Anglo-German Boundary Commission of 1898. He was involved in the operations in Nandi country during 1900 and in operations against the Ogaden Somalis during 1900-01. Following his services in combatting the plague which had broken out in Nairobi in 1902, he received a letter of thanks from the Principal Secretary of State for Foreign Affairs.

Macdonald now worked for the government and had as his assistants three sisters of the Order of St Joseph de Cluny, from France. They were Mother Auxanne Maugee, from Martinique, who was in charge, Sister Benilda Houston from Donegal in Ireland, and Sister James Hearty from Scotland. This mixed band manned the hospital until 1901, when they handed over to lay sisters arriving from England on 1 November. Mother Auxanne died in France in 1902. A plaque in her memory was placed in the Holy Ghost Cathedral in Mombasa and later moved to the hospital. The other two sisters went to the Seychelles.’

An image of MacDonald's obituary from The British Medical Journal, 5th February 1916, is attached to this lot and available through the following link,
https://www.bmj.com/content/1/2875/222.4