DATE: Probably saec. xiv (Haapanen); saec. xv (MPO). ORIGIN: Nordic (Haapanen, according to liturgical use); Sweden; Västerås, Åbo also suggested (MPO, probably according to liturgical use). OTHER NOTES: Also known as: MPO Fr 28124 (CCM Sequ 19). From same codex: MPO Codex 1030 = CCM Sequ 19 (Stockholm, Riksarkivet: Fr 28123 KB A 103 i 13; --, --: Kammararkivet Fr 2454 Värmlands handlingar 1609:18:2; Fr 7490 Lokala tullräkenskaper 529:II Västerås 1610; Fr 7491 Lokala tullräkenskaper 529:III Västerås 1610; 4 fr., 6 fol.). See also: Uppsala, Universitetsbiblioteket, Codex C 427; Graduale Arosiense.