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This has a lot of rust & pitting- a lot of patina on it. 
The logo is worn heavily but you can make out; Collins & Co Legitimus Acero Fino Calidad Hartford  and I believe the number '128'. 
The blade is extremely dull and appears to have 1 defect/ indentation/ nick (see picture #10)
I was told it is WWII era but I cannot verify this. 
I do not know if the sheath is original to the blade- there is about 2-3 inches of empty space when sheathed (see picture #13).
The sheath is worn heavily and is coming undone in some areas  (see picture #12).

Keywords: scabbard, dirk, sword, blade