Just discovered this thread, so I've added my HP from 1954 below.
I know the HP was introduced as a lower cost option to the .357 Magnum, and from what I have found, the HP was $85 when introduced. Does anyone have the price for a .357 Magnum from the same time period? I haven't been able to find that, and I'm curious as to the actual cost difference...
Anyway, here's some pics: