There have been others. But are we too late for a Favorite Acquisition of 2020 thread?
The limits of a box of 20 collector means you have to be creative. Bullion doesn't count
Rare Sheffield Smelting Co. 50 ounce poured silver bar, circa 1970, with Mocatta & Goldsmid counterstamp:
Shown here with its bigger brother.
Sheffield is one of the oldest smelters in the UK, with lineage going back to the 1760s. They were acquired by Engelhard at one point in the 1970s and produced a few co-branded bars. Mocatta & Goldsmid have been metals brokers in London since the 1670s!
--Severian the Lame