Overload proofs
 

I thank everyone for the information given but I still do not know what the overload proofs look like on Parker barrels.
Tom

1926 DHE 20/32 SN 226,624

See TPS for the chapter on barrels, chambers and barrel markings. All Parkers were proofed with loads greater than service loads. TPS provides proof and service load pressures. The marking shown below began about 1925; prior to that there was no definitive proof mark, just an inspectors mark applied when finished and after proof, usually JG or WK.

See TPS for a far better explanation.

Thank you