• I have seen similar one go for around £200 mark. But much depend on condition right?

    yeh man id say between anything from 250-300...

    And yet KG 171s often go for around £450, right? Although the 171 looks nicer (in yellow), aren't they - the KG 171 and 181 - essentially the same bike (bar the stem/forks)? I'm not taking issue with the valuation; I'm just interested in establishing the price differential.