Merchandise not for sale

The following short form of certificate will, in general, be accepted as satisfactory evidence of origin for admitting at the preferential rates of duty in the case of postal parcels of small value arriving from Commonwealth countries where the contents are not merchandise for sale“The contents of this package are not merchandise for sale, and every article herein to the extent of at least one quarter (or “one half”, or “three quarters” as the case may be) of its present value is bona fide the produce of manufacture of (name of part of Commonwealth) Dated at this day of 20 Sender.”