Question for a Sig P226 expert

[9mmepiphany]

I thought the desirable Electroless Nickel finish on SIG pistols was done by Klein who did the "factory" nickel plating for SIG in the '90s.

My understanding is that the original SIGs were nickle plated by Klein. When they didn't hold up, they tried electroless nickle. When they found that the electroless had the wear qualities they were looking for, they had the subsequent guns done by T&T in Texas