There's a M19-3 on GI that the seller believes is not nickel but a hard chrome finish. I don't know much but I've never heard of this type of finish. Could he be mistaken and it's actually nickel or could this be an after market finish?
That hard chrome is priced where a nice blue finish 19 should sell for, I like hard chrome but not shiny like that one, I’d pass on it without a second thought.