It seems about right. The nib from that era is a nicer, slightly softer writer than the current two-tone 14k nibs offered in their M400 Souverän series.
When Pelikan reintroduced the 400 (now called M400) it was based closely, and I mean very closely, on the early 1950s 400 -- a real workhorse of a pen. This will make you a very nice daily user pen if you were the one who purchased it.
Model 400 is the old pen from the 50s which was discontinued in 1965, then Pelikan changed hands in the 80s and they brought it back in 1982 to help sagging sales calling it the 400 again. The feed design was changed and the nib engraving ever so slightly also (nib width letters became italicized).
Then they changed the model number to M400 soon after for some reason, maybe because they brought out the M600, but yours is officially an M400, called "early style" by collectors because of the classic engraved logo on the cap top and lack of trim rings at the fill knob. Cool pen -- subtle and reliable.
Good buy, it ought to take ten days or so. Hang tough!
Here, read this for a while on Werner's site: http://www.ruettinger-web.de/e-pelik...souveraen.html and http://www.ruettinger-web.de/e-pelikan-modell-400.html