It looks to me that you have a 1929 cap and cap top and a post 1930 barrel and nib.
From what I know that barrel is not a first year, because a Pelikan 100 first year barrel and section was made of Bakelite in one piece only with a dark purple - burgundy colour in the ink window.
Finding a heart shape hole nib will not make this pen a 1929 Pelikan, for that you would also need a Bakelite barrel. It may be easier to find a cap and a conical cap top with the 4 logo birds and make a 1931 pelikan 100, and keep the cap and cap top if you ever find a correct barrel and nib
I have one bakelite barrel unfortunately broken in the section area ( I broke it myself
.... one of by biggest regrets dealing with fountain pens) and the colour is very different from yours. I don't have the heart shape hole nib tough, still looking!!!.
It looks to me that you have a 1929 cap and cap top and a post 1930 barrel and nib.
I am no guru! hope this helps
Best regards
Vasco
Edited by piscov, 10 April 2012 - 10:58 PM.