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Another close-up that allows us to see the internal markings of a leather lining and the way the split pins secured the leather to the inner ring. Note also the inner felt band (sweatband) placed to make the liner more comfortable and the leather circular reinforcements placed over the drawstring holes.
EVOLUTION OF THE LINER SYSTEM
As said earlier, the liner was patented by the Schubert-Werke AG, that also began to produce it directly. After the Reichsheer (and later the Wehrmacht) forwarded orders of large quantities of product, the above mentioned manufacturer, probably unable to cope with such a high demand alone, searched other companies as subcontractors or partners (this has yet to be clarified). In 1937 at least 3 different manufacturers produced the liners.
The very first liners rings were produced in aluminium using plain metal bands. This first version proved to be very easy to break under heavy usage. That's why from late 1937 a new version was produced, still made in aluminium but with two rims on the upper and on the lower side, and with to additional aluminium plates riveted as reinforcements near the chinstrap rings attachments. Nonetheless the older liner system remained in use, sometimes they were even repaired when broken and used again.
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