This is so different to Paul Reinman's style during this period that it appears to be another artist altogether. The signature is also at odds with the usual one.
Dressler's art is different from most other artists in this series, more like pen and ink in book illustrations; this most likely is his work.
This art has so many similarities with Jenney, like faces, flap-over holsters and particularly the horses on page 3. In the Jenney filler inside of the front cover of Cisco Kid (Dell, 1951 series) #2 is a gun holster exactly like the on seen here on page 2.