SCL RT1 (c1976)

https://www.seattle.gov/cityarchives/exhibits-and-education/find-of-the-month/2017-find-of-the-month-archive#july17

i wonder if this has survived?

http://clerk.ci.seattle.wa.us/search/results?s1=rt1&S2=&S3=&l=100&Sect7=THUMBON&Sect6=HITOFF&Sect5=PHOT1&Sect4=AND&Sect3=PLURON&d=PHO2&p=1&u=/~public/phot1.htm&r=10&f=S