Zenith El Primero dan Batu Turquoise

Zenith El Primero Chrono 1969 merupakan salah satu jam dari seri El Primero yang tangguh, terbukti mesin jam ini yang spek nya 36.000VPH sempat digunakan Rolex untuk seri Daytona dari tahun tahun 1988 sampai 2000 dengan nomor produksi 5 digit, jadi apabila anda punya Rolex Daytona dengan nomor produksi hanya 5 digit maka itu menggunakan movement Zenith yang dimodifikasi menjadi hanya 28.800VPH.
Movement nya tampak sebagian dari jendela di dialnya
Model: Zenith El Primero Chronomaster 1969
Reference: 27.03.0138.940
Case: stainless steel; diameter 42.00 mm; water resistant to 10 bar (100 metres); sapphire crystal to front and back.
Functions: Hours; minutes; subsidiary seconds; chronograph.
Movement: El Primero 4061, self-winding; frequency 36,000 vph ; 31 jewels; power reserve 50 hours.
Strap: Alligator leather strap with protective rubber lining on stainless steel pin buckle or available with optional stainless steel deployant.
Turquoise is an opaque, blue-to-green mineral that is a hydrated phosphate of copper and aluminium, with the chemical formula CuAl6(PO4)4(OH)8·4H2O. It is rare and valuable in finer grades and has been prized as a gemstone and ornamental stone for thousands of years owing to its unique hue. In recent times, turquoise has been devalued, like most other opaque gems, by the introduction onto the market of treatments, imitations and synthetics.
The gemstone has been known by many names. Pliny the Elder referred to the mineral as callais (from Ancient Greek κάλαϊς) and the Aztecs knew it as chalchihuitl.[4] The word turquoise dates to the 17th century and is derived from the French turquois for “Turkish” because the mineral was first brought to Europe through Turkey, from mines in the historical Khorasan Province of Persia

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