Although, PPM is considered common vintage on their second gen 5 and 10 oz pieces, the 1 oz pieces are no longer that common. As silver smalls has exploded in the collectible community, poured 1 oz pieces are heavily sought after. PPM had two versions of the 1 oz pours, a type 1 and 2. The type 1 is much more common, but the type 2 is a trapezoidal shape that appears larger at first glance, but weight is also 1 oz. These are rare an in my estimation, you will find 8-10 regular pours before seeing a trapezoid PPM.
It took me years to accumulate this many examples.
Vintage Silver Bars 