I have a M620 Shanghai in excellent condition which I'd like to trade for an M620 Berlin, or possibly another in the city series. Sadly, I don't have a box or papers for my pen. I'd like to keep the nib and just trade bodies and caps, if possible, as my Shanghai has a custom cursive italic broad. (I think all the M620 nibs are interchangeable.)
I'll try and post pictures tomorrow.