There was a Westchester Wagon works/co in New Rochelle NY, 1908, but oddly, there are earlier references to a "Westchester type" wagon in 1864......
I am thinking there was an earlier wagon works actully in Westchester...
Westchester Wagon Works still exists in 1930, so the wrench would be in about the right timeframe then....
(google says New Rochelle is inside Westchester county...)
(OK,ok, I flunked Geography in school ;P)