Later 70's early 80's #146....
There are nuances that will guide you....
I would agree that 1) The excellent FPN thread on MB #149 Dating is, well , just a guide.. the dates are estimate/range. People get too caught up in the the exact year..
2) The pinned post at FPN on #146 "dating" (that was linked earlier in this thread) is also excellent, however would agree with another poster here that the post 1970's dating is incomplete. I had emailed the author of that thread at the time and offered opinions and evidence of incompleteness, but never got a response. I have physical evidence a pen that fills a short blank in the time frame...also there is the "controversy of the "transitional" model....I have posted in other threads on other forums about this also and I believe it to to a prototype versus a mass produced "transitional".
Long ago, Dr. Isaacson would play spirited games of "what I am thinking"....with photo teasers etc...very fun and informative (don't frequent boards as much any longer so not sure David you still do that!). Last Spring, on another board, I took the liberty to play such a game in Dr. I's honor....and it had to do with #146 dating to some extent....
Here is the link , (if it's ok to link to another forum/board)..the good stuff starts at the bottom of the first page of that thread...
http://fpgeeks.com/f...ntblanc-on-eBay
Also another discussion of the "transition" #146 model...lol some of the posters in this current thread commented there also..ie Idazle 
http://www.fountainp...ere-mb146-nibs/
Cheers,
Rick
Ps...Mods...if it is impolite to link to competing boards, I apologize and kindly delete my post!
