Check for cracks, chips, or repairs, especially around handles and rims. Authentic Roseville Blackberry pottery features rich, blended glazes with smooth color transitions. Be cautious of dull or uneven glazes, which may indicate reproductions. The Blackberry motif should be well-defined and hand-detailed, not blurry or uniform. Vintage pieces exhibit slight variations in craftsmanship, while reproductions may appear too uniform.