1/2p OCP/PVA MACHIN UNMOUNTED MINT STRIP + PRINTING ERROR. I always obtain a certificate of posting. 2kg limit to Canada. Auctiva Free Image Hosting. Show off your items with Auctiva’s Listing Templates. The item “1/2p OCP/PVA MACHIN UNMOUNTED MINT STRIP + PRINTING ERROR” is in sale since Saturday, April 9, 2016. This item is in the category “Stamps\Great Britain\Elizabeth II\Decimal (1971-Now)”. The seller is “capital-collectables” and is located in London. This item can be shipped worldwide.