Good morning, Azuniga!
<...9 Soenneckens and they are all black ones, except for the <one> green lizard 222> Ha! This is about to change! Serendipity. Minutes after writing that last, I saw a new advertisement for a <blue> 507 in our classified section, offered by my old friend LimitlessPens -- so, I am now the owner of a beautiful blue one! The black 507 with flexible steel nib will go up for sale soon...
Curiously, there are two Soenneckens for sale right now: a black Rheingold 616 and another 510; but this latter has a more <rounded> blind-end to the cap than mine, which is quite flat across the top of the cap (this one is also being offered by LimitlessPens)
Edited by Christopher Godfrey, 12 February 2018 - 15:12.