Ok thanks! These were found in Rocky Mountain region of the US. This area had a booming coal industry during the early 20th century. Wonder how UK bottles got here?
Thank you. I originally thought the R was a recycle symbol but it may actually sign for "reed company"
https://www.glassbottlemarks.com/bottlemarks-4/reed-r-in-triangle-mark-1949-date-code/
Link with more info thanks
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