Offered here is a set of Jack Nicklaus' personal MacGregor VIP irons. These circa 1970s custom MacGregor VIP irons are stamped "J.N." on each toe. Jack Nicklaus himself attested to their authenticity in a 2017 letter where he states that he "can confirm they were definitely my clubs."
The irons show exceptional use by Nicklaus with some great wear in the sweet spot of each iron. Included here are 8 total irons. 2 through 9 iron with S300 shafts.
Copy of Original Letter of Authenticity and Provenance from Jack Nicklaus