This Prinztronic Mini Scientific is not listed in the Collector's Guide to Pocket Calculators.  It was found whilst searching for the Prinztronic Mini (which we now have an example of).  We are in no doubt that this was Dixon's attempt to take on the Sinclair Scientific.  The dimensions are exactly the same as the Prinztronic M and are very close indeed to the Sinclair Cambridge dimensions.  Even the battery cover is similar to the Sinclair.  The Hong Kong factory that produced these very likely reverse engineered a Sinclair Cambridge.  The result, we feel, is a very fine looking calculator.