"Black Widow" is pure bullshit...that's a collectors term for original German lugers with the black plastic grips...but they just happened to get black plastic grips, didn't "mean" anything, they weren't SS issue, or any of the other stories told...
If its an RC, its a mix, and they just happened to put black plastic grips on it...as P08 says, if they are real...could be repops thrown on toe make it a "Black Widow"...
I also think P08 is spot one (wonder why) with the value, and if they are repo grips, then I'd even say $800-$1000 tops.
RC's do nothing for me personally, but with the prices of Lugers nowadays, are at least somewhat affordable.