This is MB34 from Dixon. The 8.25x42R MB like the 8x42R MB types, exists in two non-interchangeable case types (see also MB33). The 8.25x42R MBb is very similar to the 8x42R MBb (MB32) having the same lower shoulder and what appears to be a 42mm case. Both “Utendoerffer” and R.W.S. * examples are known to exist.