Hi Blacksmith.
This is what is generally termed a back-action lock. What looks to be a screw with two little holes at the rear is likely not a screw, but just a positioning post. (don't recall the proper name) to help keep the lock in place. If you just put the hammer in half-cock position and remove the one large screw, the lock should just lift out at a slight angle. You will notice the reat of the lockplate will have a slot vs. a hole for a screw. Give it a try. Are there any screws on the left side of the stock ?
Rick
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