Shown in Photo-Lettering’s One Line (1971) in two styles, West Kerpow! and West Kerpow Shaded. At least the latter is also shown in their 1969 Alphabet Yearbook. Already used in 1966
Both styles were digitized by Allen Mercer in 2011, with added lowercase, and now named Plinc Kerpow (used for sample).
Bob Alonso’s Shazam (1995) is an earlier digital interpretation of the all-caps solid style, with small differences (e.g. small/off-center counters).