Diff of 570017B - Riquartz

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Case: [[Tungsten carbide]], two piece screw on back with battery bulge, signed "Riquartz, 570017B Ricoh Japan, 891310", inside caseback marked "9-73" for Sep 1973. Glass crystal with three vertical facets.
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Case: [[Tungsten carbide]], two piece screw on back with battery bulge, signed "Riquartz, 570017B Ricoh Japan, 891310", glass crystal with three vertical facets.

Dial: Green stone presumably [[Bloodstone]], with day & date apertures, signed "Ricoh, LSI 32768, Riquartz GTS, [[Tiger eye]], Japan 29 361"

Movement: Calibre [[570]] quartz, white ceramic circuit, cylinder quartz tube, shock proof jewel setting, signed "Ten 10 Jewels, Three 3 Adj, Ricoh Japan 570".

*Example serials [#ta590083]
-891310
--Dated Sep 1973
--This date stamp is the earliest recorded 570 watch
--IC marked "81473 7324" for 24th week of 1973
--Quartz tube marked "32K63F" for June 1973
--Marked Three 3 Adj
--Early rotating shock proof jewel setting as used on [[550]] movements.