McGill University Overseas Siege Artillery Draft Officer's Collars

A WWI McGill University Overseas Siege Artillery Draft Officer's Collar Pair - 2nd Pattern; "Overseas" as one word version. Sterling silver, maker marked "BIRKS" and date marked "1916" on their reverses, 30.5 mm x 40 mm each, intact lugs, light contact and surface wear, near extremely fine.       Footnote: The McGill University Overseas Siege Artillery Draft was organized in Montreal, Quebec.