I think you're spot on, as you say that was a good few years ago too, you have a good memory. At the time I was into restoring point-to-point 405 sets and these were a tad too modern so I stuffed them in a box. Now they are perfect for the sets I work on hence being put into current stock draws.
What had me pondering the voltage was the K after the 16. I expected the to see it after the 156 i.e 156k 16.