The R.A.M.K. stamp is from the times of the First World War documenting how long these sabres have been in use, the cancelled stamp however is of the Reserve-Artillery Regiment N°6 between 1870 and 1914.
But the both "R"s are written in a different style. Normally the "R" in italics stands for "Reserve", the normal "R" however should stand for "Regiment". So the "R.A.M.K. 15" should be red as Artillery Regiment N°15 Munitions-Kolonne.
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