Making a perpetual desktop calendar out of walnut and acrylic. Easy project using some basic woodworking tools and a laser cutter. The laser cut holes in the acrylic slide along a walnut back that ...

One thing which caught my eye time and time again was the Perpetual Calendar complication. I lost count of the times I saw them on different models and booths, actually. But it's not just the ...

Audemars Piguet’s new Royal Oak Perpetual Calendar is a very clever piece of engineering, an answer to a problem that’s been annoying watchmakers and collectors for decades, which is this. QPs, as ...