even in the light of the various defects/damage, I'd suggest that your purchase price was value for money - what in fact you have paid money for is not so much a pen but the experience from which you have (hopefully) learned a lesson - and this lesson is to be cautious about blind purchases. We all make mistakes - even those of us who should know better, and you do have the option of keeping the pen and restoring it as and when you have the funds, or return for a refund now.
As the guys here have said, most of the issues can in fact be put right, though at the end of the day it will cost you more than had you bought a fully working equivalent model, in the first place.
Who knows, it you stick with this hobby and given some time you may actually learn enough to repair this pen yourself, and if you do the cost of repair will be less than sending to a professional.
You might consider buying a copy of the 4th edition of the Marshall & Oldfield Pen Repair Manual - apart from helping you to understand some basics of restoration, the book is a very interesting read.
Wish you luck whether keep the pen or return.
just to add: The Reg. No. 784404 on the clip 'tassie' was allocated to Parker around mid 1933 by the British Board of Trade, and provided legal protection, within the U.K., for Parker's clip design for an initial five year period. This system of Design Registration has been going in the U.K. since 1840, and it was possible to extend the protection beyond the initial five years, but no idea if Parker did in fact go for the extension. According to the book, this feather design had already been the subject of a design patent, in the States, in 1932, and the clip was destined for the Vacumatic. Occasionally, British Board of Trade Registration Nos., from the first third of the C20, can be seen on accommodation clips.
See picture attached re 784404.
Edited by PaulS, 02 October 2018 - 15:43.