Hello and thank you guys !!
I never saw a jian scabbard with velvet cover ( turtoise snake-shark skin yes...)
( but I am not a specialist at all !)
Yes I think it's mahogany wood, old ?...
so,  Ren, are you kidding when you talk about this untouched by sun 100 years old ( piece of ) velvet  ? 
Maybe a shadow sword 
Kind regards