Horology is the science of time, timekeeping, and timekeepers. At the Montana Watch Company, horology is an art and a commitment to making the best timekeepers available. As the sole watchmaker for the company, Jeffrey Nashan starts with the finest Swiss mechanical movements available, rebuilding, regulating and adjusting to the highest standards of performance. Jeffrey combines time-honored practices with the latest technology and equipment to ensure that our mechanical movements are regulated to the highest specifications. All of our movements are warranted to rate plus or minus 6 seconds per day and to maintain a 30 to 40 hour power reserve at full wind.