One of the important manufacturers of mechanical chronograph's golden era, the Angelus Watch Company was founded in Le Locle Switzerland in 1891 by Stolz Freres S.A., and won many awards for it's highly complicated watches. This brand was among very few companies produced its own in-house high-end chronograph movements, that are considered among the 10 best mechanical chronograph's movements of the last century, very collectible nowadays.
The dial has two subdials: left for the constantly running seconds, right is the 45-minute chronograph's counter. The watch has the capability to measure one 5th of a second intervals via dial calibration. The watch is a triple-date calendar watch, the remarkable achievement for that time, and shows the month and the day of the week in English in unusually located up-down apertures, and the date by the red arrow-end hand on the outer scale. The size of the wtach at 38mm was large at that time but is perfect for now. These watches are still affordable but with rare dials, the prices can be as high as US$6000. I came across an original dial Angelus Chronodato in Peru and I am happy with the condition and price.