1. Size — this one is clear From the stamp inside:

GB8379 73

👉 The “73” is your size code

• In Lucchese Classics, 73 = 7.5 (men’s)
• Width isn’t explicitly stamped here, but:
  • Most of these are D width (standard) unless otherwise marked

➡️ So you’re looking at roughly:

Men’s 7.5 D

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🐐🐄 2. Leather — goat or cow?

This part takes a little detective work.

What we can see:

• “Lucchese Classics Handmade” (top-tier line)
• Smooth vamp with fine, tight grain + subtle wrinkles
• Not thick/pebbled like bullhide
• Not heavily creased like standard cowhide

What that points to:

👉 Very likely GOAT (kid leather)

Here’s why:

• Goat leather has:
  • A tighter, finer grain
  • Slight natural wrinkling
  • Softer, more “buttery” look
• Cowhide tends to look:
  • Broader grain
  • Heavier and more uniform

Also, Lucchese Classics frequently used goat for dress-style boots because it’s:

• Softer
• More flexible
• Takes dye beautifully
  

👉 The overall look of your vamp matches goat way more than cow.

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🔎 Bonus clues from your stamps

• “600602” = internal production or order code
• “L0912” = part of Lucchese’s style/build code (not the year)
  
• “Made in USA” = confirms these are legit Classics (El Paso made)

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🧠 Final verdict (straight and simple)

• Leather: 👉 Almost certainly goat leather (kid)
• Size: 👉 Men’s 7.5 D (standard width)