Direct comparable sales for the specific Mexican 'Luna 69' issue are limited, but an exact match sold at RR Auction in February 2025 for $2,756, serving as the primary anchor for this valuation. By comparison, standard U.S. Postal Service Apollo 11 crew-signed FDCs consistently realize between $2,000 and $4,000 at auction, as evidenced by a 2024 sale at Jeffrey S. Evans for $4,062.50 and a 2020 University Archives sale for $2,000. An unflown cover from Neil Armstrong's personal estate (CAG Certified) achieved $45,000 at Heritage Auctions in 2019, but this establishes a provenance-driven ceiling entirely separate from standard market examples. The fair market value for this 'Luna 69' cover is solidly situated in the mid-to-high $2,000s, reflecting its status as a scarcer international variant, though its final hammer price will be strictly dependent on the visual boldness, lack of smudging, and independent authentication of the signatures.