Confirmed by an expert, that this is an early example of a markI case, and the leather strap is original.
Went a little overboard with the oil, and pecards, but neither will hurt the item. Still amazed at how nice the leather strap feels, for being over a hundred years old.
After cleaning, I noticed some new markings:
B or 8 on the side loops
Arrow with "168" or "166" under the "RIFLE"
http://i152.photobucket.com/albums/s...psbjrnjdkj.jpg
http://i152.photobucket.com/albums/s...psnokfuylh.jpg
http://i152.photobucket.com/albums/s169/dtravmcse/4SALE/20160315_224304_zpsbheae4ht.jpg