If this is an officer's helmet, the M91 side posts are incorrect, though they appear to be applied after-market. The close-up of the post shows the retaining brad extended so as to fit the existing hole. If it is an original EM helmet, it has been chromed. I actually recently purchased a Kurassier helm that appears as though someone has tried to make it into an officer's helmet by chroming it and touching up all trim in brass or gold, plating the M-15 removable spike and base in gold, and putting a gold eagle on it. I believe in the past, people got these helmets, and tried to make them look like something they had seen at some point, based purely on memory. I believe sand blasting will be the best option for removing the chrome plating, but I've been holding out to see if I find any evidence of something like it being legitimate.