Oswin's belt ID

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Thanks to leanne1672, who got pictures at the DW experience in Cardiff, including this one of Oswin's belt buckle:

The ID is then Hi Tek Designs LONDON Alexander.

And you can buy the belt (without all the additions) here for $160 (+$8 shipping to the U.S.):
http://hitek-webstore.com/steampunk-pyramids-bel/