It is GM part# 764122 and found in group# 2.820. This is the chrome, not the zinc, cap. This has typical chrome that GM used with some small imperfections.
That being said this is as good as they had back in the day. This is a must for anyone wanting a real GM part on your Chevy Truck... The item "NOS 60 61 62 63 64 65 66 CHEVY TRUCK C10 CHROME HORN BUTTON CAP 764122 PICK UP" is in sale since Monday, April 15, 2019.This item is in the category "eBay Motors\Parts & Accessories\Vintage Car & Truck Parts\Interior\Steering Wheels & Horns". The seller is "007redline" and is located in Leo, Indiana. This item can be shipped worldwide.