This lighter is completely different from ordinary Zippo lighters. It wasn't designed for everyday use; instead, it's a museum-quality historical artifact. Unique double-layered bottom cover design: The bottom of the lighter features a brass-like plaque design. Figure 1 clearly shows "1941 Replica Yearly Code" and "1941 BOTTOM SHAPE". Documenting the changing times: It compares the original 1941 bottom cover (with the old PAT. 2032695 patent number font) with the modern 2014 bottom cover (with the year code "14" and month code "B" added). Figure 1 also clearly shows "2014 Yearly code". Collector's Choice: Zippo produces these double-bottom lighters with inlaid plaques every year to celebrate the change in the bottom engraving of a specific year. Summary: This is a rare official Zippo commemorative/display lighter for the year's bottom engraving evolution. It retains the classic retro design from 1941, is in excellent condition, and is a highly valued "special archival" collectible among hardcore Zippo collectors.