I have a BTI 858OT, and a vintage US made.
First, concerning the colours of the Delrin:
It is intentional! Taylor-Schrade brought back the 858OT. (Schrade USA only produced it from 1978 to 1984.)
The pailer ... less "pink"/red ... colour of the is one ot the things Taylor did to help ensure the offshore made knives could not be passed off as a more expensive vintage US made. BTI did not make any changes, after they bought out Taylor Cutlery.
Another major difference is the construction. The U.S. made have Swendon Key construction. The offshore have pinned construction.
Personally, I prefer pins. They are stronger, and the knife can be repaired. (The 1966/1967 Schrade made Buck 300 contract knives ad the Swendon Keys. Buck changed the contract to Camillus and pinned construction because a significant number of the Schrade made knives were being returned because of broken keys. The keyed knives could not be repaired.The few that were were stamped "FOR LIGHT USE ONLY". Allegedly Schrade had the tools/tooling to take the knife apart and replace the keys, and as necessary bad bolsters. Drilling the bolster for pins did not fully support the pins, due to the cutout inside the bolsters for the keys.
I carry my offshore 858OT and 858OTB more often than my U.S. made 858OT, because of the pinned construction. And to be honest, because if something breaks, the offshore knives are still under warranty. If the knife went AWOL ... I can still afford the offshore knives. The vintage ones in good condition are "unobtainium" for me.So far out of my budget they might as well be on Mars, if not in another galaxy.
For the record, the offshore knives and blades are the same length as the vintage US made ones.
The 7CR17MoV blades hold an edge just as well as Schrade's 440A.
They will (like 440A) take and hold the 10 DPS/20° inclusive edge I was taught to sharpen a knife to, around 65 years ago.
The offshore "OTB" knives have 9CR18MoV blades (a step higher than the popular 8CR15(?)MoV.) and hold an edge about as long as my 440C, D2, and from what I can tell, my S-30V blades. The 9CR will also take and hold the 10DPS edge I use.
The offshore knives seem to have an excellent heat treat.
If you like a large stockman the offshore 858OT/OTB is hard to beat.