This thread is yet another reason PGCA membership is well worth the money! Thanks, guys, for adding a little more to my knowledge base.

I wonder if anyone who owns a #6 frame hammer gun has ever measured the pin separation to determine whether it is some other frame size mismarked, or a real #6 frame hammer receiver?

Is a #6 frame for a hammer gun odd ?

Bill Murphy: I measured my marked 6 frame grade 3 TL hammer gun and it measures as a 7 frame. 1 7/16 between the firing pins and 1.976 across the hinge pin. The gun is very late for a TL hammer 131021. Why did you suspect a 6 frame would really measure as a 7??
The second pictures shows the 1 3/8" setting for a 6 frame and it is clearly larger. At 15 pounds with 36" bbls on a 7 frame makes this beast be one of the largest Parkers ever produced.

My 7 frame 8 ga has 38" barrels and weighs in at 15.25 lb.

Craig, I suspected that #6 frame hammer guns were mismarked #7 frames because in 60 plus years of Parker collecting, I had never seen a legitimate #6 frame hammer gun. Thanks, Craig, for clearing up this bit of information.