Since when are EnDat encoders with extended memory range built into Kollmorgen motors?

The table below gives an overview of the different encoder types with the serial number of the corresponding motors and the week of delivery for built in encoders with extended memory range.

The first encoder serial number has been defined beside the index: 15 187 112.

Both conditions (encoder index and serial number) must be fulfilled for real memory range change. Heidenhain says, that there could be a small range of encoders that don't fulfill both conditions but nevertheless have the extended memory range.