The Omega Speedmaster Professional Moonwatch. The name conjures images of lunar landings, daring adventures, and unwavering reliability. This iconic timepiece, a testament to horological engineering, has captivated watch enthusiasts for decades. While the focus often rests on the watch's robust movement and its legendary history, an often-overlooked, yet equally fascinating aspect is the crystal, and specifically, the crystal back. This article will delve into the world of Omega Speedmaster crystals, focusing on replacements, the nuances of Hesalite, and the particular appeal of a crystal back, particularly in the context of a genuine Omega Speedmaster Mark IV Black Watch Dial (reference 064PP1598007) offered as a sealed factory service dial from Omega SA.
The Speedmaster's journey, from its humble beginnings as a sporty chronograph to its status as a certified moon watch, is inextricably linked to its robust construction. This robustness extends to the crystal, which must withstand the rigors of daily wear and tear, as well as potentially more extreme conditions. The choice of crystal material significantly impacts the watch's performance, aesthetics, and overall longevity. Omega has historically used two primary crystal materials for its Speedmaster models: acrylic (Hesalite) and sapphire.
Hesalite: The Enduring Legacy
The Speedmaster Professional, particularly those associated with the Apollo missions, famously employs Hesalite crystals. This acrylic crystal, while seemingly less sophisticated than sapphire, offers distinct advantages. Its primary benefit lies in its exceptional resistance to shattering. While more prone to scratching than sapphire, Hesalite's resilience to impact is significantly higher. This was a crucial factor for NASA, who prioritized a crystal that would withstand the harsh environment of space travel and potential impacts during launch and landing. The relatively easy and inexpensive replacement of a scratched Hesalite crystal is also a practical advantage. The characteristic "dome" shape of the Hesalite crystal on the Speedmaster is also a key part of its iconic aesthetic.
Omega Speedmaster Hesalite Crystal Replacement: A Necessary Evil
Despite its durability, even Hesalite crystals can suffer damage. Scratches are inevitable with regular wear, and more severe impacts can lead to cracks or even shattering. Replacing a Hesalite crystal is a relatively straightforward process, typically handled by authorized Omega service centers or experienced watchmakers. It's crucial to use genuine Omega Hesalite crystals to ensure a perfect fit and maintain the watch's integrity. Using counterfeit parts can compromise the watch's water resistance and overall functionality. The process of replacing a Hesalite crystal on a Speedmaster Professional, or any Speedmaster model equipped with this type of crystal, is a relatively routine procedure for a qualified watchmaker.
Speedmaster Professional Crystal Replacement: Sapphire vs. Hesalite
While Hesalite remains the traditional choice, some Speedmaster models incorporate sapphire crystals. Sapphire offers superior scratch resistance, making it a more practical choice for daily wear. However, sapphire's vulnerability to shattering is a significant drawback. The cost of replacing a shattered sapphire crystal is considerably higher than replacing a scratched Hesalite crystal. The decision between Hesalite and sapphire often comes down to personal preference and intended use. For those seeking the historical accuracy and impact resistance of the original moon watch, Hesalite remains the preferred option. For those prioritizing scratch resistance, sapphire offers a compelling alternative.
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