I bought this unmarked piece of pottery about a year and a half ago on eBay for a mere $10 (plus shipping). I always knew it was a good piece and suspected it was TECO but only recently have been able to confirm my suspicions. I found a 1905 TECO catalog which pictures this piece as Design No. 78, designed by William Gates, owner of Gates Potteries. In 1905, it cost $3; today it's worth between $500-700.A truly phenomenal phind! UPDATE: Sold on eBay for $678!
