Cal. FP 951 (also known as Cal. FP 9.51) is a compact and ultra-thin automatic movement from Frédéric Piguet. It measures 20.40 mm in diameter and just 3.25 mm in height.
It is part of a family of related movements: FP 951 (with date), FP 953 (no date), FP 9511 (larger 10.5 ligne size with date), FP 9531 (10.5 ligne, no date), FP 9516 (10.5 ligne with date and 24 hour hand). The uni-directional automatic winding runs clockwise.