![Image](http://www.gbps.org.uk/boards/images/transferred/28545_1.jpg)
Like most collectors I suppose, I always thought a backstamp was a CDS or similar cache that had been stamped by hand on the reverse side of a cover, usually at the receiving sorting office. Imagine my surprise when – while sorting through a shoebox of 1937 KGVI Coronation material untouched since being obtained some 50 years ago, I came across the stamp shown here. At first glance I too it to be a superb offset. But it is mint, with full gum, and appears to be a genuine variant of the 1937 Coronation stamp presumably designed and produced for use on the back of a cover.