====== PP 28-20 ======

{{wst>image_cr|PP|28-20}}
{{wst>image_cr|PP|TO 28-20}}
{{wst>image_cr|Patek Philippe|28-20 222 Expl|Calibre PP 28-20/220, exploded view}}

Calibre **28-20 REC** is a [[hand-wound]] watch movement from [[Patek Philippe]].

This [[tonneau]]-shaped calibre has 8 (10) days power reserve.

===== Variants =====

^ Calibre^ Dimensions (mm)  ^ Jewels  ^ Parts  ^ Usage ^ Features ^
|[[PP 28-20|28-20/220]]| Ø 27, H ?| 29| |[[Patek Philippe Gondolo 10 Day Power Reserve 5100|Gondolo 10 Day Power Reserve 5100]]|2 barrels, [[Gyromax]]® [[balance]],\\ Power reserve [[10-day|10 days]]|
|[[PP 28-20|TO 28-20 REC 10J PS IRM]]|Ø 27, H ?|29| |[[Patek Philippe Gondolo 10 Day Tourbillon 5101|Gondolo 10 Day Tourbillon 5101]]|[[Tourbillon]], 2 barrels, [[Gyromax]]® [[balance]],\\ Power reserve [[10-day|10 days]]                                   |
|[[PP 28-20|28-20 REC 8J PS IRM C J]]| Ø 27, H ?| 28|142|[[Patek Philippe Gondolo 5200|Gondolo 5200]]| [[Gyromax]]® [[balance]], [[Spiromax]]® [[balance spring]], [[Pulsomax]]® [[escapement]],\\ Power reserve 192 h (8 days)|

<WRAP ud ud_mov>
**Description:**
  * [[Hand-wound]] [[manufacture movement]]
  * [[Tonneau]]-shape
  * [[Geneva Seal]], [[COSC]] certificate, later: [[Patek Philippe Seal]]

**Functions:**
  * Hours, minutes
  * [[Small seconds]]
  * Date, day
  * [[Instantaneous]] calendar
  * [[Day/Night indicator]]
  * [[Power reserve indicator]]

**Data:**
  * 28,800 A/h (//28-20 REC 10J PS IRM:// 21.600 A/h))
  * 28×20 mm, H ?

**Production period:**
  * ?-present
</WRAP>

{{tag>Movements Manual_winding_movements Patek_Philippe_calibres}}