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here's my Austria M58 and my Austria M75 side by side to compare the different details like the paint texture & color , chin straps, liners

I finally found a nice Austrian M75 with the liner clips and a matching liner, both the steel shell & liner are mfg by the same maker U-SCH-76/1 and same year of manufacture 1976

the liner is the...

thats a nice find, I dont see the ones with the retention clips very often, but they seem to be available if you look on ebay regularly

here is an Austrian M75 with the uncommon spring retention clip on ebay

Austria Army Helmet Early 1960s | eBay

Ive been searching for one of those Austrian M58/75 shells with the added spring latch to secure the liner and they seem to be not very common / rare? I havent seen any except on the internet.