Jeff,I have collected this stuff over the years. In different eras Parker Bros. hang tags were stamped use: 3 in 1 oil or Signet Oil. Signet oil was made in Gloucester Mass. A deep sea fishing port here on the East Coast so it could very well be a type of fish oil. The Signet Co. also manufactured glue.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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