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<p>[QUOTE=&quot;dgbjwc, post: 3124766, member: 308&quot;]The only American pottery I&#039;m aware of that consistently used a slash in their mark was Robinson Ransbottom.&nbsp; That might be an avenue to investigate regarding the blue vase.&nbsp; You can rule out the rest of usual suspects (McCoy, Shawnee, Hull, Haeger, etc.).</p><p><br /></p><p>As for McCoy, a variety of marks were used.&nbsp; You can find only the letters USA with&nbsp; production numbers on some of their later pieces, primarily kitchenware and cookie jars.[/QUOTE]</p><p><br /></p>

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