BobH, let us know what you find.
I'm interested in them as well since I think they make a toothbar for a bucket with a bolt-on cutting edge.
With that said, there is no "United Steel Works" listed anywhere in Mass in the yellow pages. Also, I checked the Mass Corporations Division and there is no company listed by that name. None of this is too odd since people and companies commonly operate under DBAs. However, it always concerns me when a company does not list an e-mail address, physical address and/or phone number on their website or ebay store.
By the way, they list 7-10 days for fabrication in their feedback section. One person left negative feedback because it took them 12 days to ship it??? 12 days seems pretty good to me. I guess you just can't please some folks.