There's no mixing of 'blade tang trims' so it's not a question of being cheap or lazy. This company has not been around that long so it's really not so difficult to follow their marking or stamping system, if you take the time.
TIW does not stand for Tidioute, it's Titusville Iron Works, all 1095 blades were formerly stamped either TIW or Titusville Iron Works in full depending on tang size. This applies to both Tidioute and Northfield lines. My 25 Northfield Barlow in Stag is stamped mark side Northfield UNXLD Made in USA pile side Titusville Iron works in full. Likewise, an 81 is stamped Northfield (in script) and TIW this is not some cheap labour saving or recycling of 'lower' Tidioute blades on the same frame. The carbon blades are all TIW or Titusville Iron works in full. This was changed recently to CKC -somebody suggested that there was some copyright issue on Titusville Iron Works but I can't find evidence. Titusville is their address after all. Now they've opted for plain Carbon stamping, not as visually interesting , they may soon change this too.
Formerly, stainless knives were stamped GEC USA and Cyclops on the pile side, carrying an acorn and squirrel etch on the blades and an Acorn shield. The Cyclops stamp has also been retired.