Collection Trésors Classiques

"Collection Trésors Classiques" was a French classical series by the Philips (and occasionally Mercury) labels.

It was the most prestigious classical series on Philips. This series presents the classical works from the middle ages to the twentieth century. The recordings feature the most prominent classical performers. It uses the most up to date recording & manufacturing techniques. The records are presented in the most luxurious form: with illustrations, liner notes, laminated gatefold sleeves, etc.

Older design: yellow series logo on front cover / black spine
Middle design: yellow logo / red spine
More recent design: red logo / red spine
Those 3 designs overlapped c.1973-1976 but for successive issues of a same record, it's in this order.