where did you buy your copy of Your Guide to Ping Anser Putters by Detetco?That is a zip code that Ping used during 1989. Ping made 4 different versions with that zip code. You have version 2.
Check out the publication "Your Guide to Ping Anser Putters" by Detetco page 17. They list your putter in the $35 to $75 range.
Has a nice patina.