Here up for auction is a vintage orange colored fountain pen that is marked NASSAU Pen co. with an M on the level fill, it stands for MORRISON Pen co. the cap is marked EXCELLO and has a flat top. The nib is marked keystone #3 and I don't believe it is gold. The pen will need to have the ink sac replaced but other than that it looks to be a great pen with no cracks or damage that I seen. The cap screws on both ends.