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LSS PGK - Latrobe air hardening, cold work knife and die steel. At 60HRC is should have similar wear resistance with D2, being much tougher. Go figure, why D2 is popular and this one isn't.
Alternate designations: 1.2895(W-Nr), LSS PGK(Latrobe), PGK(Latrobe), PGK(Lohmann).