Martin Grelle, New Wealth for the Blackfeet, oil, 44 x 52. Estimate: $150,000-$250,000. ← Previous Next → Martin Grelle, New Wealth for the Blackfeet, oil, 44 x 52. Estimate: $150,000-$250,000. Martin Grelle, New Wealth for the Blackfeet, oil, 44 x 52. Estimate: $150,000-$250,000.