Three most popular modern Patek movements.

Grisar

Patek Philippe developped three base movements for almost all of its current collections. (with the expection of some lady models, some extremely high-end models and of course quartz models.)

The cal. 215 is the most simple and reliable one. The hand-winding models of Calatrava line and the Gondolo line are equipped with 215. Typical models with cal. 215: 3919, 5115, 5117, 5119, 5196, 5109, etc.

The cal. 240 is a super-thin automatic movement developped in the 1970s. Most Patek perpetual calendars are equipped with this beautiful movement. Some simple automatic Calatravas are also equipped with 240. Watches with cal. 240 have either small second hands or no second hand. Typical watch models: 5026, 5000, 6000, 5120, 3940, 5110, 5130, etc.

The cal. 315 is another popular automatic movement. Althouth there has been critics on its reliability, the cal. 315 is still widely applied to Calatravas, annual calendars and perpetual calendars. Watches with cal. 315 have normally big second hands. Typical watch models: 5027, 5127, 5035, 5036, 5146, 5050, etc.

The newly (I guess in 2004) developped cal. 324 is a, technically speaking, modification of the cal. 315. Among the new specifications, ceramic ball-bearing, the newly designed balance wheel and an increase of frequence from 21,600 to 28,800 are the most significant highlights. Typical models with cal. 324: 5296, 5396, 5135, etc.

Grisar

A complete shot of 215, 240 and 315.

Picture borrowed from www.purists.com

Grisar

New perpetual calendar is equipped with 240.

Grisar

New Calatrava Ref. 5296 is equipped with newly developped 324.

Grisar

The extremely slow "evolution" of Patek base movements indirectly helps the company with the resale price on the secondary markets worldwide.

gracelaitse

CALIBER 177 的如何,不知为何3520 D 的男表和女表用不同的机芯,价钱也差近$10000

Grisar

177 is not as widely applied as 215 as base hand-winding movement. 177 is even smaller than 215.

3520D is a gentelman's watch. Due to its smaller size (32mm?), it has become a popular model among ladies now.

Is there a 3520D lady's version? I guess not.

If there are two comparable watches with hand winding movement for gentelman and lady, the price difference should be no more than $2000.
Unless one has a leather strap, the other gold chain :)

Are you comparing the 5120? 5120 looks similiar to 3520, but it is an automatic one with cal. 240.

gracelaitse

男装的3520 D 是肯定的,32.5MM, 它比 5120薄,但女装的型号不确定,没实物