Another question on patek

[Markg]

i dont know if there are any patek experts here (like there are for pam and rolex) but i have a question about a patek 5146

the web site shows the movement to be a 315, but i have read that at some point they changed to a silicon wheel 315, then to a 324. no date on the change, and like i noted above, the patek web site still shows the 315 movement (in the pictures).

any clue as to what they did and when? just want to know what to expect at the dealers (and how old their stock is depending on what movement/when the changes went into effect).

thanks,

mark