This is a Mabie Todd Swan Leverless model 4260 c1949. There aren't a lot of really pointy torpedo shaped Swan pens like this one. The Leverless operates by twisting the knob at the end of the barrel which turns a metal pressure bar unit that compresses the sac. The 60 in the model number was for the color black, 20 was blue, 30 was grey, 40 was green, and 50 was burgundy. The Number 2 nib is 14 karat gold and all the trim is gold filled. These pens have a very large imprint, which is on the opposite side of the barrel, and the model number is stamped just above the twist button at the end of the barrel. It's about 5 1/8 inches long.