West German M56 Helmet with Helm1A1 Liner & Camo Cover

Description

West German M56 Helmet with Helm1A1 Liner & Camo Cover.
Research provided: http://www.theocadcollection.com/euroclones---an-essentiel-collectors-guide.html
Stahlhelm (M 56):
The earliest Bundeswehr helmets were almost exact copies of late wartime US M1. They were made of manganese steel and weighed about 1.5 kg complete. The official designation was Stahlhelm, while the liner was designated Helm. Both parts together were called zweiteiliger Stahlhelm (two piece steel helmet. The first 190.000 pieces were manufactured between 1956 and 1958 by Linnemann & Schnetzer (in Ahlen) and F. W. Quist (Esslingen) The resinated cloth liners were made by Schuberth (in Braunschweig), Römer (Neu-Ulm), Bebrit Preßstoffwerke (Bebra), Maury & Co (Offenbach) and Römmler (Großumstadt). . Chin-straps were initially bar tacked to the hinged loops, later attached by clips as on past war US M1s. The helmets were coloured olive-green (orange for MPs, blue grey for parade), a splinter pattern camouflage cover was provided. The manufacturer’s initials location and last two years of the date were stamped inside the body, liner and on the webbing. Some 190,000 were produced between June 1956 and October 1958, when the decision to adopt a single shelled helmet was made. The liner alone, however, continued to be used a Protokolhelm for parade use. Later versions of these were made by Schuberth of blue grey thermoplastic and are so designated by a stamp inside.
Helm1A1 or Helm Bodentruppen (modifiziert):
In the 1970s the Bundeswehr tested various modified suspensions, and in February 1981, officially adopted the Helm1A1 (modifiziert). All subsequent helmets were built to this standard, while approximately 100,000 helmets per year were retrofitted on being returned to depots by released conscripts.
Improvements were achieved by extending a sort of nape holder down the back side of the liner, so that it would hold better on the wearer’s head, as in a construction worker’s helmet. Also it was improved by providing it with a chin-strap fastened to the brim at three points, like the Israeli M1 clone. Technical details were designed in a VTL in 1982. Retrofitted Helm1A1s  retain the peened over rivets for the old chin-strap clips. It was also produced in a gigantic “Übergröße” 73 for head sizes 62-66, using a shell that looks rather different to the normal sizes.
Clearing out Dad's estate, please take a look at the other auctions, will combine shipping.
Item is listed to the best of my ability, no expert here and researching as I go, please reach out with any questions or additional information.
Auction - A172