I wouldn't be too quick to write these helmets off as replicas. I have recently purchased a couple of reference books, and have learned quite a bit from reading them, even though the information on these metalhelme is sparse. Apparently these types of helmets were available for purchase from many makers into the 1920s, and you could select your style, such as the 1889 vs 1899 or 1915 models. To me it looks like a couple of M-1867 helmets, and one M-1889 or 1899 helmet with a mixture of fittings and attachments, because, as I have experienced, finding originals is nearly impossible. I have been in a situation where I had a JzP shell, but was unable to find anything original for it, so I had to settle for reproduction parts.