Actually we did measure the “original” Zebra and the MOI was 17.5832 ou/in² (3215 gr/cm²). Weight was 320 grams. So, although it was a very popular putter (I used one for quite a while back in the day when I was playing competitively), by today’s standards it would not be considered a high MOI / forgiving putter. 320 grams is very light. The lightest we design putters today is 350 grams and tend to go even heavier. The lighter weight and the smaller head size is why the MOI was not that high. Great putter though, in my opinion, if you have a small impact zone. Still have mine and get it out from time to time.