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Kettner is an old Cologne company with a shop in Klein Glochen Strasse selling all types of sports gear including firearms and shotguns. They don't manufacture guns but pre-war many of the weapons they sold were manufactured in Suhl which was post-war in East Germany. If you are trying to search for historical information of dates of munufacture then unfortunately most of their records were destroyed the result of bombing raids in the last world war. Until recent years the original shop was situated in the main shopping street of Colgne (Koln). The High street.
Saint Bruno is the founder of the carthusian order and we celebrate his feast day on the 6th of october he was born in the year of 1030 in colgne he concieved a new order of monks who he decided would be hermits like those of old so in 1084 he and six companions began the task of setting up the order of the carthusian .