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A last thing is this restauration made in the front side who seems to had been done in period time .
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Cerjak, its possible that it was a working lifetime refurbishment. What it appears from the pics is that you had a section that cracked a bit on either side and was cut away ( it looks to have been done perhpas with a chisel and then smoothed out ) between and then a replacement piece flush riveted in ( you can see four smaller rivets below the two large ones ). Flush riveting is a technique where the rivet is piened into a hole that is slightly counter sunk so that it spreads out to fill the countersink making it smooth to the surface and then burnished. When well done it can be nearly invisible. The two larger visible rivets correspond with the other nearly flushed rivets that held the liner ( these are piened close to allow the visor or brim to come down without getting hung up on them ) and the patination seems to match closely that of the rest of the helmet. Working life reapirs of this sort were done but of course this technnique for replacing damaged metal on armour was also quite common for auction houses in the 19th and earlier 20th centuries as well. It's difficult to say with certainty from pictures but it is possible this repair was done when the helmet was still in use.