The earlier top levers did not have springs.
I believe Parker made the change to springs in about 1888-90.
Somewhere around the 45,000 to 50,000 serial number range.
The ones made for srings are drilled differently than those not made for springs. It is very hard to get springs to work/ seat correctly in one not made for them. Everyone I know who has tried this ends up taking them out and the guns works much better.
Sorry for such crude numbers/ dates but I am going off memory while are work and dont have any of my reference material handy.
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