The "W" trademark is indeed Jack Weigand's...
And $750 is a very good price. I paid more than that for my 65-5 LS that was done by Mike LaRocca, formerly the head gunsmith at Pachmayr.
As others have said, if the modifications are to your liking, read that: Something you would have paid to have done, then jump on it.
Adios,
Pizza Bob