Hi,
I have just joined this forum. I am a tool collector, specializing in Billing & Spencer items. Wrenchmensch, I have more than a dozen of these old B&S socket sets, as well as numerous loose pieces. I'll look tonight for the 7/16 you need.
I have literally THOUSANDS of B&S tools, including plenty of duplicates that I would love to trade. If anybody is interested, please let me know.
I also have an extensive collection of B&S literature, and I am happy to answer questions about the company or its products.
DAN