The Monmouth and Pembroke both house an automatic NH35 movement. Made by Seiko in Japan, the NH35 is a self-winding mechanical movement that is powered by the movement of the wearer's wrist. The NH35 is known for its reliability and durability, making it a popular choice among watchmakers.
The NH35 movement is a manual winding movement that can also be wound by hand using the crown. It has a power reserve of approximately 41 hours. The movement features a date function, with the date being displayed at the 3 o'clock position on the dial of both the Monmouth and the Pembroke. The movement is also easy to service and maintain, which makes it a great choice for watch collectors and enthusiasts.
In terms of accuracy, the NH35 movement is known to be accurate, with a tolerance of around +-20 seconds per day. However, the accuracy of the movement can be affected by factors such as the position in which the watch is worn and the overall condition of the watch.
Overall, the NH35 is a reliable and accurate movement that is widely used in wristwatches. Its durability and easy maintenance make it a popular choice among watchmakers and collectors alike.