Gary, I found this Perfected at my LGS a couple weeks ago. Finish is not great but function is good.
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The serial no is 55549. The last patent date is Sept. 14, 09. Since it doesn't have the 1914 patent date, would we think it does not have the hammer block? I am not sure I know how to tell if it has it, but when the trigger returns after a snap it makes three little clicks and then the hammer is solid as a rock in rebound position.

I think it will be a good shooter but haven't had it to the range yet. BTW I gave $200 for it.