Hutchinson bottles are worth the most, but they are incredibly rare and there are counterfeits out there, so be careful.
With regards to markings on the bottom or side of the bottle, it’s really hit and miss. Some bottles have a name embossed on them, e.g. Root to represent the Root Glass Company, while others have small numbers that are located on the base or neck of the bottle. The numbers are usually in 2-digit format. E.g., ‘47’ might indicate that it was made in 1947.
There may be multiple numbers on the bottle in a sequence – you can guess which one refers to the date based on the style of the bottle and where it was likely produced.
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