Hello,
my name is Michael and I am a freelance 3d-artist and graphic designer from germany.
I have lots of experience in 3d-modelling, texturing and rendering, especially in the field of product renderings.
Your budget is very tight for a project like this.
All in all, with modelling of the pen in a high quality and different animations for an one minute ad, I could deliver this for 1000$.
I'm looking forward to hear from you.
Best regards,
Michael