[BillyCoxDodgers3B]

Another thing to always consider:

Flat calligraphy nib practically always = Coach's Corner-caliber forgery.

Go back and look at your dyed-in-the-wool authentic vintage fountain pen pieces. Heck, you can do it from memory. How many of them were signed using such an implement? My guess is none.

This type of fountain pen simply was not in popular use back then. For fun, let's pick a name from the fountain pen era who signed everything put in front of him. Say, Charlie Gehringer. OK, now how many examples have you encountered that were signed with a flathead calligraphy nib? For me, it has to be zero, and the number of fountain pen signatures I've handled, studied or examined has to total hundreds of thousands.

Those types of pens were always the cheapest and most readily available to find in the 80's and 90's at stationery shops. Usually in a calligraphy kit. As a rule of thumb, forgers are cheap. These pens were cheap. 1 + 1 = 2.