CGC x JSA Signature Analysis: Wilt Chamberlain

Posted on 10/9/2026

JSA Senior Vice President James Spence III shares insights about the NBA legend's autograph.

By James J. Spence III

With the NBA season starting up, collectors are naturally looking toward basketball's greatest icons. Few loom larger than Wilt Chamberlain.

Working with major auction houses worldwide gives our team at JSA access to rare, never-before-seen signatures that expand our database. A common question we get is how we verify exemplars for signers who are no longer alive. We build that foundation using rock-solid, concrete historical items like passports, credit cards, and notarized documents.

In-Person Encounters: Meeting "The Stilt"

Getting Wilt’s autograph in person was unforgettable. At age 13, I was at a card show trying to get a multi-signed basketball signed for my dad's friend. The show required two tickets for multi-signed items: a base ticket and a special multi-signed ticket.

Not knowing any better, I only bought the multi-signed ticket. When I handed Wilt the ball, he signed it, but his handler noticed I was missing the base ticket. Wilt stood up and demanded the extra ticket. Being yelled at by an angry 7-foot-1 superstar was easily one of the scariest moments of my life! Luckily, his handler realized I was just a kid without money, shooed me along, and reassured Wilt. Wilt sat back down to keep signing, but I never got to shake his hand.

Signature Evolution & Handwriting Traits

Chamberlain’s handwriting is remarkably clear — you can read almost every single letter in his name. Here is how his signature evolved over time and key traits to look for:

High school (1955) - Our earliest example comes from his 1955 high school yearbook, showing a young, carefully drawn handwriting style. We were also fortunate enough to authenticate the signature on Wilt's game-used high school jersey, owned by legendary collector Joel Platt of Sports Immortals.

Harlem Globetrotters era (1958–1959) - During his Globetrotters stint, Wilt signed many team programs with a clear, fully spelled-out signature.

The "l" versus "t" height characteristic - A key authentic habit in Chamberlain's signature is that his lowercase "t" is consistently taller than his "l" in "Wilt." While it doesn't happen on every single signature, it is a very common trait found across a multitude of authentic items.

Pen breaks on basketballs - When signing basketballs, Chamberlain naturally encountered surface resistance, resulting in frequent pen breaks. Most notably, he is extremely consistent with a distinct pen break between the "h" and "a" in "Chamberlain."

Fan mail & early secretaries (1969+) - With his rising fame, fan mail became impossible to keep up with without help. Wilt appointed someone as early as 1969 to handle fan correspondence. At JSA, we keep both genuine and non-authentic secretarial examples in chronological order so we can date pieces accurately and explain their origin.

Warriors clubhouse signatures - We first noticed non-malicious "clubhouse" (secretarial) attempts on Philadelphia Warriors team-signed basketballs. These show atypical letter formations, sizing, and slants for that era.

Boca Raton coasters - Near the end of his life, Wilt owned a restaurant in Florida called Wilt's, where he routinely signed items for patrons. The most common item from this era is the restaurant coaster — you'll often see the inscription "Peace" on these items. I've examined more than 500 of them at JSA, and I even keep one in my collection!

Inscriptions, Fakes & Market Records

Inscriptions - The one inscription Wilt hated signing was "The Stilt." Because real "The Stilt" inscriptions are extremely rare, forgers often add this nickname to fake photos to boost value. Real inscriptions usually include "100" or "HOF 78."

Forgery Risk - High. Fakes are very common. Be cautious of severely underpriced “too good to be true” situations.

Auction Record - High-end JSA-authenticated pieces signed by Chamberlain fetch premium prices. Among the highest-selling JSA-authenticated Chamberlain items at auction is his Signed Official 100-Point Game Score Sheet, which realized $122,400 through Goldin Auctions.