Dan: Your Parker 57087, while not in the "BOOK", is in a range of "D3" guns built in 1889. That translates to "Grade 3" in stock book "20M" or "G" Grade. Some one here should be able to tell you how to get the hammers cocked & firing pins released, if not, call Jim Kelly at Darlington Gun Works at (843) 393-3931. He will be able to tell you. Tell him that I told you to call.
Best Regards, George
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