QUOTE(jmkeuning @ Feb 10 2008, 07:45 PM) [snapback]510268[/snapback]
I don't know if it was "sudden" - I suppose to consumers it was. . . here one day, gone the next. However, I am sure that within the machinations of the marketing department, the decision was not so sudden.
However, if you mean "recent" - well, the change was not so recent. AFAIK, it happened at least four years ago. Maybe five.
I have spent the past few days lamenting the discontinuance of the 600. Especially the Trio.
I think the logo came off the 600 more like 10 years ago. My "knurled ends" 600 has no logo emblazoned on the side. I would guess that removing the logo was a design decision rather than something having to do with the Sanford takeover. The 600 is a stark, utilitarian, even severe design that is not improved by slapping a billboard on the side. That's just my opinion though. But I'd suspect the corporate overlords would be more likely to add the logo than remove it.
The logo may be a rarity and therefore more valuable from a collectibility standpoint, but if OP is right about it being the original configuration it's limited to the "knurled ends" variety. The "knurled ends" 600 is already more highly sought after because it's the original design, although once again I'll inject my opinion: though the differences are subtle, I think the "plain ends" 600 is the better pen, and it is at least the more durable pen. Though the differences are minor and certainly the "knurled ends" variety is an excellent pen, I wouldn't pay extra for the knurled ends and certainly wouldn't pay extra for the logo unless I planned to put it in a display case.