Today my "new" Breviarium Romano-Seraphicum arrived in the mail, published by the authority of our minister general Clement of Milwaukee in 1962. According to Summorum pontificum 9,3 I now have permission to use this version if I wish. (And if I can learn how!) The set seems to have once been ad usum for a Father Louis of the Couvent des Capucins in Mons, Belgium. They have a nice website you can visit here. Louis must have passed from this life or returned to the world soon after inscribing his name in his new breviaries, because they are hardly used.
The breviaries are illustrated with little Capuchin friars in various actions and postures of prayer: