I do see some chatter mentioning "De Prins Freres" or "De Prins Bros." Just including this as a search term.

An alternate spelling is "Gebrevetteerde." Google Translate says it means "certified."

De Prins was in Borgerhout, Antwerp, Belgium.

Really nice info at http://www.rjmartz.com/horns/DePrins_092
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If you want to change how many album pictures per page, use CTRL+ and CTRL- (Command + and Command - if you have a Mac).  80% looks great on my 4K monitor.