That was my read as well. ("Pittsburgh base", listed at bottom)
That's just a screenshot, if you go to the first link, you can read not only the full chart, but there are historical prices for iron, aluminum, and many other metals.
For each metal, they try to list significant historical events that they think might affect pricing.
I think to find the resale price you'd have to find a catalog from that region for that time period.
I remember someone posting a tool catalog on here that sold stock, but I believe it was from late 19th century.