Martin Grelle, Trailride in Chisos Basin, oil, 30 x 40. Estimate: $10,000-$20,000. ← Previous Next → Martin Grelle, Trailride in Chisos Basin, oil, 30 x 40. Estimate: $10,000-$20,000. Martin Grelle, Trailride in Chisos Basin, oil, 30 x 40. Estimate: $10,000-$20,000.