Blancpain

Ever wonder how the perpetual manages to change the date from the 29th of February to March 1 in one evening? Note the first date change around 945 pm and again at 1045. The final date change is around 12:40 Am to March 1 This horological complication is ... 

www.youtube.com Patek QP This is with the 48 came

with clear explanations of the 48 tooth wheel txs

nice of Martyn B for taking the time to capture it. I have a nifty book, "A Guide to Complicated Watches" by Francois LeCoultre that has great drawings and great (but challenging to follow in detail) descriptions of all sorts of complications. I highly re... 

Perpetual, and it change date at 00:00. When the battery changed, memory will keep the correct date. ...  

Preprogrammed for 100 years, but that’s “cheating” doing it in software vs hardware. ...  

I think a 400 years.