This was the most popular of the 12.5mm MB straight case lengths. It was introduced around 1877 and continued in production until WW1 and was produced by numerous manufacturers. Shot loadings were also produced.
No. 1 produced by G Egestorff with cross (large font)
No. 2 produced by G Egestorff with cross (small font)
No.3 produced by H. Utendoerffer
No. 4 produced by N. von Dreyse