The HEYM looks to be in very nice shape, but it is an older model with the semi-beavertail forend, more squared receiver bottom, older stock shape and the smaller frame size. It is the "PH" grade with no engraving. 12.5 lbs tells me that some weight has been added too.

The current 500 is available on two different frame sizes:
- The smaller frame finishes up at 10.5 pounds.
- The larger frame finishes up at 11.75.

Smaller frame on the left.

Now on the right.

All of the additional weight is in the receiver and chamber end of the barrels, so it puts even more weight between the hands.

The price on the used HEYM is close enough to new cost that you might want to consider ordering one made to fit.