History of 550002 (No. 48)

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Introduced about 1972, using calibre 550. Available in stainless steel or gold plated. Advertised in Feb 1973 "Playboy" magazine as the “Ricoh quartz crystal wrist computer, guaranteed accurate to 5 seconds a month ... miniature miracle ... guaranteed for two years” for $295 (the mechanical watches carried a ten year guarantee)

The 550002 features better accuracy than the 550003 (+-5 secs/month vs +-15 secs/month) despite using the same movement. There is a difference in cost reflecting this (¥93,000 vs ¥55,000)

Cases†

• Stainless steel - 93,000円 - $265 in 1973
• Gold plated - 118,000円 - $295 in 1973
• (The most expensive mechanical watch in the same advert is $95)

Dials†

• White stone at 12, possibly a quartz
• Day & date apertures at 6
• Tiger eye
• Painted
  • Flat silver
  • Fading brown
  • Two tone gold or silver

Books†

"... 550002 88,000 yen and "Tiger Eye" is 5 yen. In the company he is 55,000 March 1,000 students of course "iron". A wide variety of steel materials developed at the appropriate materials center... We use "Tiger Eye," which is made from "Requartz." It was announced that it would be released from the end of August. A new crystal watch should cost 50,000 yen for the first time."

Example serial numbers - Case - Movement†

Note first digits range from 1 to 7, second digits are 1 or 2, third digits are 2 or 3

• Earliest recorded watch July 1972 - 123605

• Latest recorded watch Dec 1972 - 622112

Example serials†

122342†

122376†

122646†

122797†

123098†

123117†

123148†

123509†

123528†

123605†

312205†

312311†

#ref(): File not found: "550002-312311-2.jpg" at page "550002"

#ref(): File not found: "550002-312311-1.jpg" at page "550002"

312928†

313465†

313468†

313709†

322225†

With inscription, watch must've been 5 years old at the time

323265†

#ref(): File not found: "550002-323265-2.jpg" at page "550002"

#ref(): File not found: "550002-323265-1.jpg" at page "550002"

323393†

422295†

422372†

522230†

622112†

Case only, no movement, number faint so not 100%

622170†

622272†

722353†

722439†

     

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