Blancpain added the second barrel to gain the 4th day. And what a workhorse this movement has been! ("If it ain't broke, don't fix it.") Utilized since 1988, a comprehensive list of iterations is available at Grail Watch Reference, under "FP1150 Family."

Hi, I was looking at a Blancpain Leman 2850. I wanted to double check on the authenticity as it is without box and papers from an auction. Is the 2850 available in a blue dial? I have just seen the white and black 2850-1130-53 Thanks, Akshay