Rory McIlroy has made more equipment changes than any other top player on the PGA Tour this season, but one club he’s stuck with has been a prototype Odyssey putter. And since the 27-year-old started using the putter early this year, it has has been both literally and figuratively a secret.

As Odyssey does with several of its prototype models, the sole is engraved with question marks to highlight its prototype nature. And out of respect for McIlroy’s current status as an equipment free agent — the No. 2-ranked golfer in the world says he’s playing without an endorsement deal from any equipment manufacturer — neither Odyssey or its parent company Callaway is commenting on what clubs he’s currently using.

That brings us to this week, where we spotted new Odyssey prototype putters on the putting green of the Valero Texas Open, one of which looked almost identical to the prototype putter McIlroy is using. It’s called the 3T, and appears to be a new model in the O Works line Odyssey unveiled earlier this year. While the putter is black, it seems to have the same shape and size as McIlroy’s prototype, and also uses Odyssey’s new Micro-Hinge insert, which the company says helps putts roll more true.

So is Rory’s Odyssey putter coming to retail? A Callaway representative says that the 3T, as well as the other Odyssey putters we spotted in Texas, are just prototypes for now. If it did, however, it’s safe to say that a lot of golfers would buy one.

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