Sixth Avenue Fountain PenMiami Vice Birmingham Pens 4 Of 11 Edition. I have used this pen maybe a dozen times. It is number 4 of 11 of the Miami vice edition made. It engraved on the barrel.
If I find the certificate I'll send it along with the pen. They no longer make this version of the pen. I believe it is a medium nib.It doesn't have a marking. Cap in-use: CAP WILL POST. Grip diameter (Bottom): 12.3mm. Grip diameter (Smallest): 11.0mm. Grip diameter (Mid): 12.4mm. Barrel diameter (Largest): 15.8mm. Cap diameter (Largest): 17.6mm.