Not sure if this is Germany-only or for all A.P.C. stores. The German text reads:

From May 15 to 26 in all A.P.C. boutiques there will be a selection from previous men's and women's collections available, with discounts of 30% and 50%

r/frugalmalefashion – APC Archive Sale in-store (30%-50% off)

r/frugalmalefashion: The place for coupons, discounts, sales, and deals when it comes to male fashion. Visit the Wiki for more information regarding guides, stores, and tailoring help.