Hi there, I've been following the great discussions on here for a while but never posted before. A v.brief intro....I'm an amateur / relatively new collector of pens with a small collection of Mont Blanc, Waterman and vintage Parkers. I recently purchased my first Pelikan last week and that is the impetus for this post! It was bought from ebay from what appears to be a reputable and credible seller with no red flags. Solds as a mint/unused M650 - black barrel, silver/Vermeil cap. The pen arrived and condition was as described and all looked in order BUT it has a 14K monotone nib. My understanding was that all M650s were fitted with 2-tone 18K nibs? This has clearly got me concerned that this is a 'frankenstein' - either the nib has been changed, or possibly the barrel is that of an M600 (or even M400....would that fit the cap?). The alternative is of course that it is a fake, but I don't believe that to be the case. I'm still in the window of opportunity for returning the pen, but love the model and still hopeful there's a reassuring explanation! I'd be hugely grateful for any help, info. or advice. Very best, Kaivan ps. Can post a picture later if that's helpful....