This is a new aftermarket replacement for KZ1000 G1 ClassicIgniter (CDI).
The original markings may have been stamped on it: 21119-1017, 21119-1040, 21119-1429, F8T50272, Fuji Electric, IC Igniter (The original part is show in the photo above)
The new replacement ignition unit larger and will mount differently than the original part. Part is a plug and play (see orange part)
This unit has some improvements over the stock unit: