These two stamps commemorate the Salvation Army’s centenary in Norway, celebrated on February 18, 1988. This is an official centenary cover issued by the SA itself, with a grey ribbon at the top. Some local corps were aware of the stamp issue and used it to have this cachet cancelled on the first day of issue, as this cover in Sarpsborg. Note: This cachet is quite rare; I have only seen issued with a Gjøvik PM previously.