This is the EM-GE Mod 100 air pistol. It was added to the collection a couple of months ago. These are quite rare to find now. Surprisingly this particular example is 5.5mm/.22 calibre whereas others that I have seen are typically 4.5mm/.177 calibre.  The pistol has also been seen advertised at the EM-GE LP100. Some variants do not have the EM-GE medallion as seen in this example.