Well as I'm no lexicographer'sterile' seemed the most apt word that sprang to mind
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As the number prefix 7.92 Brens are deviod (not scrubbed or ground off) from manufacture of any parts that bare makers marks or codes,no inspection or ordnance,acceptance or ownership marks inc woodwork....also no steel batch code.
I'm now at a loss as how best to descibe their state ?
ATB Kevin