Frankoma Pottery Marks: From Leopard Paw to Prairie Green Era
Frankoma Pottery of Sapulpa, Oklahoma is one of the most distinctively American potteries — both in its regional identity and its use of local clay bodies that give Frankoma pieces an immediately recognizable character. Founded by John Frank in 1936, the company operated under family ownership until 1991 and in various subsequent ownerships until 2010. Frankoma appears frequently at Midwest and Southern estate sales, yard sales, and flea markets, often at very accessible prices — and specific pieces are worth considerably more than sellers realize.
The Leopard Paw and Early Marks
The earliest Frankoma pieces (1936–1938, made while John Frank was still at the University of Oklahoma) carry a 'Frankoma' mark with a small leopard paw print — derived from the University of Oklahoma mascot. These early pieces are the rarest and most valuable Frankoma. From 1938, when the pottery relocated to Sapulpa, the mark became simply 'Frankoma' stamped in the clay. Later marks include 'Frank Pottery' (briefly, after 1942), then 'Frankoma Pottery' in various formats. The most common mark is 'Frankoma' impressed in the base, which covers the bulk of production from 1938 through the 1980s.
Clay Bodies: Ada Clay vs. Sapulpa Clay
The single most important dating and collecting distinction in Frankoma is the clay body. Ada clay (used 1936–1954, when the Ada clay deposit was exhausted) is a warm, honey-gold to light tan color — creamy and fine-grained. Sapulpa clay (used 1954 onward) is a distinctive brick-red/terra cotta color that shows prominently at unglazed base edges and interiors. Collectors strongly prefer Ada clay pieces: the honey-colored clay produced a warmer interaction with glazes, and the era of Ada clay production coincides with Frankoma's finest designs. Turn any piece over — if the unglazed base shows warm golden clay, it's Ada; if it shows red-brick clay, it's Sapulpa.
Glaze Eras and Their Collecting Value
Prairie Green (a sage-to-olive matte green) is the most iconic Frankoma glaze and was used throughout Ada clay production — the combination of Prairie Green over Ada clay is the most sought-after. Desert Gold (a warm tan/amber matte glaze) was also produced during Ada clay years. Later Sapulpa clay production introduced additional glazes: Woodland Moss, Robin Egg Blue, Peach Glo, and others. Christmas plates (produced annually 1965–2010) are a separate collecting category: complete sets are worth $300–$800; individual plates from desirable years range $5–$50. Limited edition political plates (Bicentennial series, political events) carry premiums in Oklahoma collecting communities.
Condition Grading for Frankoma
Mint (M): no chips, no cracks, glaze fully intact — full value. Excellent (E): minor base chip, glaze intact. Good (G): small rim chip, glaze 90%+ intact. Crazing is common in Frankoma glazes, particularly the matte glazes of the Ada clay era, and is generally accepted by collectors as a period characteristic — it does not significantly reduce value unless accompanied by staining. The most common damage: chips on the edges of flat pieces (plates, trivets) and on spouts of pitchers and teapots. Ada clay pieces in Mint condition consistently sell for 3–5× the same forms in Sapulpa clay.
On-Site Identification Steps
Turn the piece over and look at the clay body color: golden honey = Ada clay (pre-1954, higher value); brick red = Sapulpa clay (post-1954, lower but still collectible). Read the mark — look for the leopard paw for the rarest early pieces. Identify the glaze — Prairie Green over Ada clay is the highest-value combination. Check condition: run your finger along all rims and edges. For plates, check the rim and back for chips. Cross-reference shape numbers (impressed in the base on most pieces) against published Frankoma catalogs to identify specific forms. Most Ada clay Frankoma pieces at estate sales are priced as decorative pottery — identifying them as the more valuable clay body is the collector's advantage.
FindA.Sale helps you find estate sales, yard sales, auctions, and flea markets listing Frankoma and American pottery near you — search your region to plan collecting trips.