The choke device on that gold colored 20-gauge Double Auto certainly looks like a Weaver Choke to me.
20-gauge double auto.jpg
Weaver-Choke 1962 Gun Digest.jpg
One of the hunters in my father and his buddy's loosely organized hunt club had a truck farm in the Kent valley southeast of Seattle right where Boeing decided they needed to build something, as I recall their aero-space development center. Gave him a bunch of money. All Ray did was move out a little farther and get another little farm putting the rest away for his retirement. He did splurge on one thing, a Satin Gray Double Auto. In all the times I hunted with Ray and his two great German Shorthairs I never saw that double Auto come out of the rack in his old Willys pickup. Always carried his old straight grip A5 with black tape around the grip.