ROCHESTER TUMBLER CO. No. ..30-31 (OMN) tumbler by Rochester Tumbler Company (Rochester-PA, Company Operated: 1872-1901), mid 1880's introduced
NOTE: Sid Lethbridge 2023 - Rochester Tumbler No. 30 which also appears in the 1901 National Export catalogue but dates years earlier - likely mid-1880s based on the colours available. Note that No. 30 has a rayed base and No. 31 has an unpatterned base but is otherwise identical.
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Shape: Catalogue/Ads
Contributor: Sid Lethbridge - 1901 National Export catalog

Shape: Tumblers
Contributor: Jo Durrance - OMN 30 with rayed base