Term used by commercial potteries fo the mark printed on the underside of their wares.
Found on http://www.encyclo.co.uk/visitor-contributions.php
The term used for the mark printed by potteries on the underside of pottery and porcelain to denote the makers name, pattern, style, date, etc.
Found on http://www.antique-marks.com/antique-terms-b.html
In philately a backstamp is a postmark on the back of a letter showing a post office or station through which the item passed in transit. The office of delivery may also backstamp a cover and this type of mark is known as a receiving mark. Backstamps are often applied as documentation of transit times, lengthy ones in the case of ocean crossings o
Found on http://en.wikipedia.org/wiki/Backstamp
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