London Assurance Corporation A.D. 1720 Enamel/Porcelain Sign 18" X 12" 1916 (?)

Description

Up for your consideration is a Very Old London Assurance Corporation A.D. 1720 Enamel Sign 18" X 12" It is a great vintage Enamel/Porcelain (?) sign that as can be seen has some loss it measures 18" wide and 12" high and is heavy (weighs in at about 3.5 pounds prior to safe packing).
There is what maybe a date on back 3-16 (See Pic March 1916?). It is also marked bottom right but hard to make it all out. Pretty sure its Balto (Baltimore Enamel & Novelty Company) and their address whose claim to fame was license plates in very early 1900's they also hand marked the back of plates etc. with dates in same color as front. Sign does have 3 mounting holes top/bottom and one on each side.......Thanks for looking in!!
Other Internet findings:
The London Assurance Corporation was established by Royal Charters granted in June 1720 (marine business) and April 1721 (fire and life). It became a subsidiary of the Sun Alliance in 1965.
Its first offices were in the "Rising Sun" in Broad Street, E.C. In August 1720 it moved to a house in Castle Court, Birchin Lane E.C. (formerly the "Ship and Castle" tavern built upon the site of the "Dolphin Tavern" destroyed by the Great Fire in 1666) where it remained until another fire in March 1748. New offices were built at 19 Birchin Lane E.C. and it remained there until 1845. From 1845 to 1922 its head office was at 7 Royal Exchange, E.C. and from 1922-65 at 1 King William Street, E.C.4.