Generally, Parkers with factory installed vent ribs or flat ribs had a flat top standing breech.
A factory installed vent rib will not have been installed on top of an original matted rib.
There are at least two types of original rib ramps - one with a wedge cut into the ramp and one without but these both have flawless factory finishes where they are actually an integral part of the doll's head.
Most original factory fitted vent ribs had the last three digits of the gun's serial number stamped on the underside of the rib, generally between the second and third post from the breech end and only visible with the use of a mirror.
There are other identifying features that come only to the practiced eye which are difficult to describe here.
I wish you luck.
Rich Anderson has a 16 ga. GHE Damascus with an original vent rib. Maybe he can show you close-ups of his.
Best, Dean
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