====== PP 175 ======
Calibre **175** (and the similar calibre **177**) is an ultra-thin [[hand-wound]] watch movement from [[Patek Philippe]].

This ultra-thin movement is based on [[Piguet 21|a 90 year old design]] from [[F. Piguet]] and remains in production today.

===== Info =====
Patek Philippe used [[Piguet 21|a F. Piguet ebauche]] to produce their own ultra-thin 9 [[ligne]] watch movement. Although based on this venerable design, Patek Philippe modified the movement extensively. They added their patented [[free-sprung]] [[Gyromax]] balance and finished the movement to [[Geneva Seal]] standards.

===== Cal. 177 =====
{{wst>image_cr|PP|177 SQU}}

Cal. 175 beats at a leisurely 18,000 A/h, but the derivative **Cal. 177** beats at a more modern 21,600 A/h. Apart from this, the movements are very similar.

Cal. 177 remains in production.

===== References =====
Cal. 175 and 177 was used in many watches, including the following popular references 

  * 175
    * [[Patek Philippe Calatrava 3520]]
    * [[Patek Philippe Golden Ellipse 3577]]
  * 177
    * [[Patek Philippe Calatrava 3520]]
    * [[Patek Philippe 7180]] (skeleton)

===== See also =====
  * [[Piguet 21]], the [[ebauche]]

<WRAP ud ud_mov>
**Description:**
  * [[Hand-wound]] ultra-thin movement

**Functions:**
  * Hour/minute hands

**Data:**
  * 18,000 or 21,600 A/h
  * 9 [[ligne]] (20.8 mm) wide, 1.77 mm high
  * 18 jewels
  * [[Geneva Seal]] or [[Patek Philippe Seal]]

**Production period:**
  * 1970's-present
</WRAP>

{{tag>Movements Manual_winding_movements Ultra-thin_movements Patek_Philippe_calibres}}