Different Size and Style of long service Awards?

[Uffz. Rohleder]

Hello all.

I found a Long Service Medal and compared it to an other LS Medal. They are not just different size they also has a slightly different design.

Are those maker differences? I can't believe that something like that was ok at the time.

Note the the size difference (ca. 3mm) and the letters

here the IX and the rim