I can accept that early on, a higher 'Dollar Grade' gun would have had a 'higher grade' lock. This practice is still in use by European makers. However, I would be inclined to think that at some stage, Parker thinking would have standardized on a single lock plate for all guns. This might not have been true prior to the top lever, but I'm not sure there was sufficient argument that the 4th bridgeplate screw made for a smoother lock.
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