Hi Gordon, it's just my poor photographic skills. I have measured them with a digital vernier gauge and the arms are all the same size
Thanks, if the one on the left is a later piece that might explain the differences. The one on the right does appear to be a finer quality casting.
Thanks everyone for the replies, I did think they were both OK, but not being too clued up on German medals I wanted to check. I do have other medals all WW1, so will post up some photos of them