![GPO Post Office Lead Bag Seals](https://www.historydetector.com/wp-content/uploads/2021/09/GPO_POST_OFFICE_LEAD_BAG_SEALS-348x215.png)
The Mystery of the GPO Lead Bag Seals
A common find for newbie metal detectorists that often leaves them a little perplexed, is the vintage GPO lead bag seal. These little white squares of lead, measuring around 18mm …
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