Thor Steel Letter Figures Catalog Pittsburgh Stamp Company Vintage 1931 For Sale

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Thor Steel Letter Figures Catalog Pittsburgh Stamp Company Vintage 1931:
$50.00

The Pittsburgh Stamp Company published a 20 Page traded cataloghighlighting their line of Thor Steel Letters and Figures.The letter of authenticity with it is dated 1931 and is signed by MM Purdy.Interestingly, the initials and name "M.M. Purdy" do appear in a completely unrelated historical tech context: an M. M. Purdy co-authored engineering and technical safety memos for Bellcomm in 1964 regarding the emergency detection systems for the NASA Apollo Spacecraft program.Catalog & Product Details

Manufacturer: The Pittsburgh Stamp Co., Inc. (located at 812 Canal St., Pittsburgh, PA).
Product Line: Thor marking stamps, steel letter sets (A-Z), and figure/number sets (0-9).
Key Feature: Thor stamps were famously known for their "blue heads," which indicated that the special alloy steel had undergone precise heat-treatment for extra durability and long-wearing uniformity.
Applications: Designed for heavy-duty industrial machinist marking, stamping metal, wood, and steel tags.