Seiko Original Watch Crystal SA1N55GN00 (for 1100-3610) – NOS

Genuine Seiko replacement crystal for the Seiko 1100-3610 model, reference SA1N55GN00 , made in Japan. The crystal is a classic "Crystal X-" from the late 1960s/early 1970s period and exactly matches the original crystal fitted to this model.

Unused original spare part (New Old Stock, NOS) in original Seiko paper sleeve.

Compatible models

The watch crystal SA1N55GN00 is demonstrably designed for the following models:

• Seiko 1100-3610 (Formal dress watch, hand-wound, 1100A caliber)

• Compatibility with other 1100 series models is very likely, but cannot be guaranteed (e.g., 1100-xxxx variants).

Technical data

• Manufacturer: Seiko (Hattori Seiko Co., Ltd.)
• Part: Watch glass / Crystal
• Original reference: SA1N55GN00
• Alternative reference: CRY-3784
• Model compatibility: Seiko 1100-3610
• Caliber: 1100A (manual winding)
• Shape: Round, flat
• Type: “Crystal X-” (typically Hardlex in this era)
• Origin: Japan
• Condition: NOS – unused, original packaging
• Packaging: Original Seiko paper envelope in red/beige