Depends on which model, if they are the sheriffs star version they can go for a lot, photo might help, you should probably put it in the how much thread...
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eBay is a bit unpredictable at the moment, SRs normally go for upwards of £200 suspect these will go for a lot less, probably somewhere between £60 and £100. Daft thing is these are apparently more robust than the SRs as the flanges don't break on them...