Sorry for the delay in getting back - The books I was looking for have been packed in storage since 2010.
Sadly I did not find any info on your item as the Brass Locomotive Checklist I have is from 1949-1969 and it does not list Pacific Pike company at all. Perhaps manufactured sometime in 1970?
And I even looked in a 1967 Walthers catalog hoping to find a reference to that company. Trivia on that catalog - It is less than 1/4" thick.