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From ARRSEpedia

The Ordnance QF 20 pounder, also known as the 20 pounder or 20 pdr, is an 83.4 mm tank gun used in intermediate marks of the Centurion MBT and in the Charioteer tank destroyer¹. It is the successor to the popular 17 pdr, and the predecessor of the 105 mm L7, the latter of which is essentially a 20 pounder "necked up" to take a larger projectile².

[edit] Notes

1. The Charioteer was an upgrade to the ageing Cromwell with a different turret.

2. Someone may care to verify this...