Just picked this up from the bay. It is an Esterbrook, but I don't know the model. The pen is black (plastic), 5 1/8" capped and 4 3/4" w/o cap. The nib is marked 2550 which I assume is the size? It came with 2 extra nibs a fine and a medium. I cannot raise the lever so I am assuming that the sac is bad.