407. Potosí, Bolivia, cob 4 reales, 1677E. S-P37b; KM-25; CT-502. 9.4 grams. Nice details on both sides (full cross and pillars-andwaves) despite usual corrosion and large edge-crack, 2 dates. With ROBCAR certificate #M090308. Estimate: $100-$150. 408. Potosí, Bolivia, cob 4 reales, 1678E. S-P37b; KM-25; CT-503. 7.7 grams. Corroded and mostly flat but with bold second date in legend, bold waves, decent but off-center cross. With photo-certificate. Estimate: $100-$150. 409. Potosí, Bolivia, cob 4 reales, 1678E. S-P37b; KM-25; CT-503. 6.9 grams. Full pillars with bold date, messy cross due to heavy corrosion. With photo-certificate. Estimate: $100-$150.
410. Potosí, Bolivia, cob 4 reales, 1678E. S-P37b; KM-25; CT-503. 4.2 grams. Very thin from corrosion but with bold full pillars and 2 dates. With photo-certificate. Estimate: $100-$150. 411. Potosí, Bolivia, cob 4 reales, 1678E. S-P37b; KM-25; CT-503. 7.9 grams. Lot of nice detail (full cross and pillars-and-waves, 2 dates) despite thinning from corrosion, broad flan with crude edge. With ROBCAR certificate #M090306. Estimate: $100-$150. 412. Potosí, Bolivia, cob 4 reales, 1678E. S-P37b; KM-25; CT-503. 8.2 grams. Good centers (bold pillars, 2 dates) but flat peripheries, some corrosion. With ROBCAR certificate #M090302. Estimate: $100-$150.
413. Potosí, Bolivia, cob 4 reales, 1679C. S-P38; KM-25; CT-505. 8.9 grams. Well detailed on both sides (full cross and pillars, 2 dates and mintmarks and assayers), toned, lightly corroded all over. With ROBCAR certificate #M090310. Estimate: $100-$150. 414. Potosí, Bolivia, cob 4 reales, 1679C. S-P38; KM-25; CT-505. 8.7 grams. Full but off-center pillars, full but doubled cross, 2 assayers, pitted from corrosion. With photo-certificate. Estimate: $100-$150. 415. Potosí, Bolivia, cob 4 reales, 1679C. S-P38; KM-25; CT-505. 7.1 grams. Two dates, but otherwise mostly flat (weak strike) and thin (corroded). With photo-certificate. Estimate: $100-$150.
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