Valuation of second-hand machinery: use Chartered Engineer's declared new-machine price as base for depreciation calculations. Depreciation for valuation of second-hand machinery shall be calculated on the price of the new machine as declared in the Chartered Engineer's certificate; where the certificate does not state the price as of the year of manufacture, Customs must use the declared new-machine price as the base original value without further inquiry into historical c.i.f. prices, and earlier instructions requiring such determination are modified accordingly.