A few years ago, the Longines brand launched its new Master Collection Retrograde watch collection. It was timed to the 175th anniversary of the brand and it showed some interesting mechanisms made specifically for Longines ETA. Two watches are offered, both made of 18-carat pink gold or stainless steel. Longines Master Collection Retrograde watches are available in sizes 41 and 44 mm wide. The models are quite versatile.