When it comes to high-quality watches, the materials used to make them play a crucial role in their overall performance and longevity. In this article, we will delve into four key watch-making materials - solid stainless steel, sapphire crystal glass, PVD coating and Seiko NH series movements - and explore their respective quality.

Solid Stainless Steel

Solid stainless steel is a popular material used in watch-making due to its durability, corrosion resistance, and ability to maintain its shine for years. Stainless steel watches are also resistant to scratches, which is an essential factor in the longevity of a timepiece. Additionally, solid stainless steel can be finished in different ways, such as polishing, brushing, or sandblasting, providing watchmakers with endless design possibilities.

However, not all stainless steel is created equal. The quality of the steel can vary depending on the grade, with higher grades being more resistant to corrosion and wear.

Sapphire Crystal Glass

Sapphire crystal glass is one of the most scratch-resistant materials used in watch-making. It is made of synthetic sapphire, which is second only to diamond in hardness. Sapphire crystal glass is highly transparent and has excellent clarity, making it an ideal material for watch crystals. It also offers exceptional resistance to impact and temperature changes, ensuring that it remains unscathed in most situations.

However, sapphire crystal glass is not entirely shatterproof, and a severe impact can still cause it to crack. Additionally, due to its high hardness, it can be challenging to machine, making it more expensive than other types of glass.

PVD Coating

Physical vapor deposition (PVD) coating is a process used to apply a thin layer of metal onto the surface of a watch. The layer can be made of various metals, including titanium, gold, and black or gray-colored coatings. PVD coating provides a hard and scratch-resistant finish that can improve the watch's appearance and durability.

High-quality PVD coating will be even and consistent, with no visible defects such as bubbles or flaking. Additionally, the coating should be highly resistant to wear and abrasion, ensuring that the watch maintains its appearance over time.

Seiko NH Series Movement

The Seiko NH series of movements is a collection of mechanical movements produced by Seiko, a Japanese watchmaker with a long history of producing high-quality timepieces. The NH series is known for its robustness, accuracy, and affordability, making it a popular choice for watch enthusiasts and hobbyists alike.

The NH series includes a range of movements with different complications, including simple three-hand movements, date and day-date movements, and even movements with hacking seconds and manual winding capabilities. One of the most popular movements in the series is the NH35A, which is often used as a base for modified or customized watches.

The NH movements are built with high-quality materials and are designed to be reliable and long-lasting. They feature a 24-jewel system, a frequency of 21,600 beats per hour (or 6 ticks per second), and a power reserve of around 41 hours. The movements are also designed to be easily serviceable, with
many interchangeable parts that can be replaced if needed.

The Seiko NH series of movements is a reliable and affordable option for anyone looking for a quality mechanical movement for their watch. They are widely used in both Seiko's own watches and in watches produced by other brands, and have a strong reputation for accuracy and durability.