I suppose this could be the beginning of a debate but I have noticed something that is a bit surprising to me. My experience (so far, at least) would indicate that the Parker 45 is typically a smoother writing pen than the "51." Let me explain:
About 5 years ago, I purchased my very first Parker 51, a1949 Aerometric from the daughter of its original owner, a man who obviously took good care of his Parker 51. The pen is the classic Forest Green with a 14K Gold-filled cap and is a wonderfully writing fountain pen. Since then, I have purchased two more "51s" truly "in the wild." Both of them are vacumatics. All three of my "51s" have the more common fine to medium fine nib and all three have about the same degree of writing smoothness with, perhaps, my first "51" being the smoothest.
Just a few days ago I posted a response on this forum about Parker 45 converters and an experience I had with my first "45." All of this got me to thinking because I now have 4 Parker "45s" and, with the exception of one of them, they seem to write with a smoothness one would expect from a "51." In fact those three "45s" write smoother than all three of my "51s." So my question is this:
Did Parker really perfect their expertise in "nibology" (is that a new word?) to the point that the somewhat inexpensive Parker 45 consistently writes with "51" or better smoothness or do I have three "51s" that are not characteristic of how smoothly a "51" can write? Granted, it seems that the "45" is typically a wetter writing pen and the finer nibs of my 3 "51s" would naturally "feel" less smooth because of a smaller contact surface but the question, I believe, is one worthy of comment by those of you with more experience in this area.