Such was my case when I spoke about pocket pens one year ago (May 17, 2010). Despite my initial doubts, I ended up publishing a chronicle in which I said that they were invented by Pilot in 1968-69. Well, I was mistaken.
This Platinum pocket pen was made before 1968, as the nib shows through the logo on the nib. 
The old Platinum logo. 
Again, the old Platinum logo on a nib from, probably, the 1940s. The nib shows both the brand name —Platinum— and the name of the company —Nakaya (Seisakusho).Now (as of July 2011) I read on the Platinum website that this company had released the first pocket pen in 1964—and that makes some sense. That explains, for instance, how the old Platinum logo –that of the world globe– can be seen on a pocket pen. The new logo –the stylized P— was introduced in 1968, according to the same website, and this contradicting some claims dating this change in 1963.
The new logo on a B nib. 
The Nakaya logo, on the box and on the nib, resembling the old Platinum logo. Later on, in the early 2000s, the old Platinum logo was revived to create that of the Nakaya line of pens.
2 comments:
Thank you so much, this was very helpful. I have a pocket pen with an 18K nib and older globe logo and was trying to date it. Sounds like 1965-1968 or so.
Thanks, Anonymous, for passing by and commenting.
Now, albeit the change of the logo is done in 1968, there are pen with the old logo some years later. The best way to date your pen is by checking the manufacturing date on the nib: https://estilofilos.blogspot.jp/2013/09/datation-of-japanese-pens-iv-platinum.html
Cheers,
BT
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