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As @Lolo has pointed out - the fork might not be in SLX New steel. They have no sticker so I can't say unfortunately. They will not fit 28mm tyres.
@wintyDono That New Success kit was the very last Sachs groupset developed with Campagnolo.
SRAM killed the brand when they bought it (one way to cut competition!).
In terms of value, it is really worth what people want to pay for it - checked on eBay and about £150 for the mini gruppo seems to be the ballpark.EDIT: I know @Lolo is not having a dig - it is good to have additional info!
Special bike, fork crown is very unique and that new success kit is worth a fair bit.