Yup, just to add on to what Lorenziluvrr, IBL70 and Webhawk have said - it could be any one of Santa Cruz, Loriblu or Gianmarco Lorenzi. From the looks of it though, it does seem to me that it is a Santa Cruz pair. I have two pairs in black leather (one pair with the metal heel, and the other in the normal style).
With respect to what Lorenziluvrr has said, I have ordered from both Primafila and GML boutique and both have impressed with their prompt service and excellent communications. I have ordered more from Primafila though, primarily because they carry GML, and Santa Cruz in their eBay store. GML boutique has GML and Loriblu and Icone though - I am looking out for a size 42 overknees black leather from Icone on the GML boutique eBay store to no avail. Yup, there was a ton of activity in 2007 on Primafila shop - heck, Lorenziluvrr and I may have been bidding against each other on the same items (and went broke at the same time - I am still recovering from that hit today)!

Postage is ok to me I guess, have paid more to other individual sellers and they weren't even as fast.
Finally, a 42 will fit a US 10.5 great - good luck with your hunt! You won't regret purchasing these though I favour GML the best (haven't tried Icone stuff yet though cos they always happen to be just one size too small...grr).
Best regards