Type Blanc overprinted (Rouad, Ile 1916)

Stamp Type Blanc overprinted it reflects the thematic directions:

In Abrahamic religious traditions (such as Judaism, Christianity, and Islam) and some sects of other belief-systems like Hinduism and Buddhism, an angel is a heavenly supernatural or spiritual being. In monotheistic belief-systems, such beings are under service of the supreme deity (i.e. God).

Abrahamic religions often depict angels as benevolent celestial intermediaries between God and humanity. Other roles include protectors and guides for humans, such as guardian angels and servants of God.[3] Abrahamic religions describe angelic hierarchies, which vary by religion and sect. Some angels have specific names (such as Gabriel or Michael) or titles (such as seraph or archangel). Malevolent angels are often believed to have been expelled from Heaven and called fallen angels. In many such religions, the Devil (or devils) are identified with such angels

Elements of industrial instrumentation have long histories. Scales for comparing weights and simple pointers to indicate position are ancient technologies. Some of the earliest measurements were of time. One of the oldest water clocks was found in the tomb of the ancient Egyptian pharaoh Amenhotep I, buried around 1500 BCE. Improvements were incorporated in the clocks. By 270 BCE they had the rudiments of an automatic control system device.