"Don’t hesitate – send an owl today. And don’t forget to attach your details."
-- advertisement for the Mnemosyne Clinic appearing in the Daily Prophet (DP4)
Advertisement for a memory clinic appearing in the Daily Prophet (DP4)
"Poor memory? Forget where you left your wand? Wish you could remember spells without referring to cumbersome books?" The Mnemosyne Clinic for Memory Modification will help, as long as you remembered to send them your contact details.... (DP4)
While the date printed on DP4 is 1 October 1999, the timeframe for these events is 1992-1993.