Are any members of this forum aware of other such receiver rail markings? What letters or numbers have you observed? Do they also appear on non-Danzig produced Gew 88s? Do they appear on other German rifles (e.g., Mauser 71/84s and 98s)? If you're aware of any of these marks, please report the year and arsenal of the rifle (such as 1891 Danzig). Pictures would be great!