It is in effect a pair of vertical scissors. You hold it as if it were a small pistol.Mine came with two other blades and I seem to remember using it to cut thin soft metal.Models do sometimes come up on Ebay. There was an Eclipse Goscut 2000 on EbayUK recently. It sold for £16.50. Mine seems to be an older model and I'm wondering if it was made by a small firm taken over by Eclipse.
Discussion of how to use a Goscut can be found in the Model Engineer forum here.
DEAR GOSCUT FANS PLEASE ACCEPT MY APOLOGIES THAT I HAVE LEFT MY BLOG UNTENDED FOR SO LONG.I WAS ASTONISHED WHEN I FOUND YOUR FASCINATING AND VERY HELPFUL COMMENTS. I WILL SEE IF I CAN GET THEM PUBLISHED BUT FOR THE MOMENT I NEED TO RELEARN MY BLOGGING SKILLS.
James