History of 512070(No. 4) - Riquartz

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- 1 (2024-06-04 (Tue) 20:47:17)
- 2 (2024-06-14 (Fri) 20:44:32)
- 3 (2025-06-24 (Tue) 17:49:01)
- 4 (2025-10-21 (Tue) 21:56:13)

Case: Tungsten carbide either polished or gold plated, gold plated stainless steel bracelet

Dial: Onyx or stardust onyx

Cal 510

Examples†

Hitachi LSI CMOS signed "7E4 841" for 4th week of May 1977
Quartz signed "NDK 75F" [presume for May 1977]