====== AP 2511 ======
Calibre 2511 was one of the early [[quartz]] movements produced by [[Audemars Piguet]].

Introduced in [[1977]], Cal. 2511 was used in the unusual rectangular [[Audemars Piguet Royal Oak|Royal Oak]] line. It has 11 jewels.

Cal. 2511 was produced in the initial heyday of quartz movements, when the accuracy of this new technology was highlighted. Therefore, it has a highly unusual adjustment mechanism The crown adjusts the hour hand when pulled, leaving the timekeeping and minute hand running. An inset pusher in the crown advanced the minute hand at intervals on demand, on the assumption that it would always be correct.

This movement was used at least through [[1980]] in the Audemars Piguet Royal Oak Quartz. It is round, even though it was used in rectangular watches and its predecessor was rectangular. The original battery was mercury-based, and replacements do not power the movement more than 12 months.

The similar [[AP 2510|Cal. 2510]] used a separate pusher at 4 00 and was launched as early as [[1974]].


<WRAP ud ud_mov>

**Manufacturer:**
  * [[Audemars Piguet]]

**Description:**
  * Second-generation [[quartz movement]]

**Functions:**
  * Central hour, minute, and seconds hands
  * Hour hand and date adjustment using the crown in first position
  * One-second corrector pusher inset in crown

**Data:**
  * 15 months battery life
  * Accurate to +/- 1 second per month

**Production period:**
  * [[1977]]-?
</WRAP>

{{tag>Movements Quartz_movements Audemars_Piguet_calibres}}