Natural Bridge Caverns (San Antonio, Texas) Sign

Winning Bid: $4,000

Natural Bridge Caverns (San Antonio, Texas) Sign:

Painted wooden sign for Natural Bridge Caverns (San Antonio, Texas), the largest commercial caverns in the state of Texas, depicting the cavern’s mascot character Grendel the Dinosaur, painted by San Antonio artist Dan Martinez (American, 20th c.) and displayed on billboard advertisement circa 1970s

height 46 in. x width 70 in.

Provenance: Property from the personal collection of a New Braunfels, Texas gentleman who has collected vintage signage for several years, who purchased the sign directly from the artist’s daughter from her home in Alamo Heights, Texas

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DAY ONE: The Texas Ranch Auction

Start: Sep 27, 2025 13:00 EDT