I managed to pick up a real Franco-Prussian War Bavarian Raupenhelm from 1870 from a Militaria Dealer in Germany to add to my Franco-Prussian War display:
I was surprised to see this helmet sell for 725 Euros, Louis I hate to be the bearer of bad news and hope you don't wanna shoot the messenger but you really should consult an expert or at least only buy from reputable Militaria dealers when making purchases. I believe I've tried to warn you before and also another small warning ebay is NOT the place to buy Militaria. This was relisted many many times looking for a bite.
If you look at the underside of this Helmet you will see empty holes for the correct black wool caterpillar mounting system as well as the replaced bolts through out. The warning signs like the mismatched chinstrap, wrong cockade, and all that black polish all over the insignia trying to cover bad work should scare collectors off. The pealing of the leather on the back of the helmet also detracts from the market value. Sadly It was put together from several parts from different helmets with the intent to fool someone.
Without having someone you can trust to steer you in the right direction, having a well stocked Library of reference books to help guide your purchases is your best bet. These books will be a good step in the right direction and should help guide you in building your Franco/Prussian War collection. I will say this, finding original items from this period are next to impossible, please be careful, an original Raupenhelm from this period would be twice what you paid for this if you could find one, buyer beware my friend. Sorry for the bad news.
All this being sad, if your happy with your purchases that is all that matters in the end, but if you should ever try to sell and wanna get top market value for Original pieces its gonna be a very painful lesson. Collecting Original Militaria is a nasty business with many "dealers" lying in wait to make a buck. Its real BIG business taking advantage of new collectors to the Hobby, we used to joke about the MAX Show years ago that if you turned out the lights and turned on a black light the glow from that place could be seen from Mars.