The 40 Years FSC devices are generally better finished, but show the same range of sizes and quality as the 25s

50 years in same private employment, RV

The superfluous mini EK2 device was certainly in use in mid-1919, and based on persistence in Saxony, in particular, as late as 1938, it may have been introduced without authorization during WW1, RV.

All sizes and qualities may be found of this device, too, RV.