Cobolt blue sea glass with UGB 20 on it

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ab2022

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This was a nice sea glass find today. I've found out that UGB is United Glass Bottle Manufacturers Ltd which dates the glass to 1913-1968 I believe. But I wasn't sure what the "20" on it means. Is it a weight or perhaps a date? This is the bottle base I assume and it's around an inch across in size, so pretty small.
 

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