You can have any part you want hallmarked, it certainly doesn't need to be standard, and doesn't need to be the same on every piece If you want monogrammed tags, I'd be wary of punching them - you'd then have punches used on both sides of the tag, and I think they could thin the metal too much, and potentially distort.
However, you could get tags made up somewhere like:
Jewellery Tags : Perfect Presents, Engraved Gifts and Jewellery
I think Nic might have the same bit of kit used for these if she hasn't already sold it.
That said, I only monogram (using letter punches) pieces that don't need hallmarking, as those that do will have my makers mark on anyway.
If you want to have your own punch, you can have the assay office make an extra one and return it to you - they're £60 (don't know if there's a student discount on these too).
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