Re: Hsc holster
I cleaned up that very same holster for a friend a month ago.
His father acquired an HSc in the service and he inherited it.
It was in far worse condition than yours, being covered with mold and very dried out.
I started with a damp soft cloth with saddle soap, then followed with more cloths with warm water to clear off the saddle soap.
I let it dry overnight, then gave it several light applications of light neatsfoot oil.
It turned out better than expected. My friend thought that It was ruined when he gave it to me, and didn't believe it was the same holster when I returned it to him.