RARE WW1 36th Infantry Arrowhead Div Isorel Masonite SSI Enameled Insignia Sign For Sale

This sign shows the early shoulder sleeve insignia (SSI) adopted by the 36th Infantry "Arrowhead" division of the United States Army.YOU WILL BE RECEIVING THIS SIGN ONLY, THE SET PICTURE IS FOR INFORMATIONAL PURPOSES.From a nearly? complete set of signs that are shown in the third picture. This set consists of each of the shoulder sleeve insignia used by units from the 1st world war, and are a very hard, glossy paint that I am assuming is an enamel on a confirmed Isorel board painted black, and measures 12 x 12 inches (30.48 cm). They are separated by that thin black paper packaging so common in that era. I am certain that it is Isorel by the cross like pattern of the pressing on the back which matches the Isorel pattern exactly. Isorel was the precursor to Masonite, which was not patented until 1924 and did not begin mass production until 1929. This set was likely produced some time after the war as most units did not have an insignia until then.
About the set:
This is obviously a very rare set and I am confident that it was issued by a significant organization, maybe even the US Military given the quality of the signs. I have had speculation on what they could have been for and it has been suggested that they might have been for a veterans group, but I think that they might have been used more for design purposes, possibly by a company that was in the business of supplying the newly adopted insignia patches to the various units in the US Military. Each of the 85 signs in the set have a hole on the top and bottom of the sign which I believe would be used for mounting, and they appear to have been extensively used. I will be offering each sign for sale individually so please be sure to stay tuned to my other listings as these become available.
About the 36th:
The 36th Infantry Division ("Arrowhead"), also known as the "Panther Division", "Lone Star Division", "The Texas Army", or the "T-patchers", is an infantry division of the United States Army and part of the Texas Army National Guard. It was organized during World War I from units of the Texas and Oklahoma National Guard. It was reactivated for service for World War II 25 November 1940, was sent to the European Theater of Operations in April 1943, and returned to the Texas Army National Guard in December 1945.A unit of the 36th Infantry, the 2nd Battalion, 131st Field Artillery, was detached and sent to the Pacific just before the outbreak of war in late 1941. Captured by the Japanese and forced into slave labor, its fate was unknown for most of the rest of World War II, resulting in the name of The Lost Battalion.The 36th Infantry Division was reconstituted in a May 2004 reorganization of the 49th Armored Division.The division has been active in search and rescue efforts following natural disasters, as well as supporting the rebuilding of affected areas. Prior to WW1 the 36th Infantry Division was activated as the 15th Division, an Army National Guard Division from Texas and Oklahoma. The new unit also received a new commander, Major General Edwin St. John Greble. The designation was changed to the 36th Division in July 1917. The unit was sent to Europe in July 1918 and conducted major operations in the Meuse-Argonne Offensive. On 9–10 October, the unit participated in heavy combat near the village of St. Etienne. Following this victory, which included the capture of several hundred men and officers of the German Army, as well as artillery, the unit launched an assault near an area known as "Forest Farm." The eventual victory brought World War I to an end, yet during World War I, the division suffered 2,584 casualties, 466 killed in action and 2,118 wounded in action. The unit was inactivated in June 1919. shlf

---