Are Serti Dial 116613 and 16613s Not "Real" Rolexs?

[sdhornesq]

I am currently in the market for a 16613 (or 116613) black bezel and champagne serti dial for my first Rolex. To try and nail down which one I preferred I stopped by my local AD and tried on a 116613. No 16613s in stock.

Anyway, as I was leaving I asked if they sold serti dials there too. The clerk told me that it was not done that way and the watch would need to be sent to Rolex to have the dial inserted IF Rolex allowed it for that model. Because no model in her catalog included a serti dial, she did not think it was possible to do and if it was done then the watch would not be a "real" (not authorized) Rolex.

Is that true? I've seen enough examples of these watches with the champagne serti and love the look.

Thanks in advance.