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Claim analyzed
General“The Miyota 0S10 movement has a diameter of 30.8 mm and a height of 4.13 mm.”
Submitted by Swift Whale 60b4
The conclusion
The stated dimensions match Miyota's own official technical specifications exactly. The manufacturer's PDF explicitly lists the 0S10 movement at Φ30.8 mm diameter and 4.13 mm height, and two independent third-party technical documents corroborate these figures identically. A small number of lower-authority retail listings cite slightly different measurements (e.g., 30.5 mm, 30.45 mm), but these discrepancies likely reflect differing measurement conventions or listing errors rather than a genuinely different specification.
Based on 7 sources: 5 supporting, 2 refuting, 0 neutral.
Caveats
- Some third-party retailers list slightly different dimensions (e.g., 30.5 mm diameter, 4.06 mm height), which may reflect different measurement conventions such as 'outside diameter' versus base movement diameter.
- The 30.8 mm figure is the manufacturer's nominal specification; actual physical measurements of individual units may vary slightly due to tolerances.
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Sources
Sources used in the analysis
MIYOTA Watch Movement Cal.0S10, Chrono hour/min/secDateLong Life Battery, Chronograph movement.Size:13 1/2''' Heigh:4.13mm -YOUR ENGINE- Metal movement made in Japan ... 0S10 ; Size: 13 1/2''' ; Height: 4.13mm ; Accuracy: ±20 sec per month; Battery Life: 5 years.
0S10 0S11. Φ30.8. Pusher. SR927W. Attached. Stem. 065-453. ... 13 ½'''. Size. <ligne>. Height. <mm>. 4.13.
This is a 13 1/2 ligne movement with a diameter of 30.80 mm and a movement thickness of 4.13 mm. The overall movement height is 5.96 mm.
MOVEMENT SPECIFICATIONS. CAL.0S10. 13-1/2 LINGE, 3 EYES CHRONOGRAPH. ANALOGUE QUARTZ, 0 JEWEL. BY CITIZEN WATCH CO., LTD. JAPAN. MANUFACTURED IN JAPAN. 1. BASIC SPECIFICATIONS. (1) Cal. No. *TO CONFIRM WITH MOV'T DRAWING ATTACHED. CALIBRE. Ligne. Size*mm. Date. Total height. Battery life ... Φ30.80mm. 4.13MM.
Outside Diameter: 13 1/2 Ligne or 30.5mm; Movement 4.06mm thick; The height from the bottom of the watch movement to the top of the sweep second pinion is 6.0mm.
The Miyota 0S10 watch movement is listed with a diameter of 30.45 mm.
高精度0S10ムーブメントの厚さはわずか4.13mmで、コンパクトです。 (The high-precision 0S10 movement has a thickness of only 4.13mm, making it compact.)
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Expert review
How each expert evaluated the evidence and arguments
Expert 1 — The Logic Examiner
Miyota's own technical PDF explicitly lists the movement as Φ30.8 with height 4.13 mm (Source 2), and multiple independent documents repeat 30.80 mm and 4.13 mm (Sources 3–4), while the refuting sources provide different figures without showing they are measuring the same dimension under the same definition (Sources 5–6). Given the manufacturer spec directly matches the claim and the contradictions are plausibly definitional/measurement-listing errors rather than a logical disproof, the claim is true.
Expert 2 — The Context Analyst
The claim omits that some third-party listings report slightly different outside diameters/thicknesses (e.g., 30.5 mm & 4.06 mm at Esslinger; 30.45 mm at EmmyWatch), and it doesn't clarify whether those discrepancies reflect measurement conventions (e.g., “outside diameter” vs. base movement diameter), rounding, or listing errors rather than a different spec [5][6]. With the manufacturer's own technical sheet explicitly giving Φ30.8 and height 4.13 mm and multiple independent documents matching those figures, the overall impression that 30.8 mm diameter and 4.13 mm height are the standard Miyota 0S10 specs is accurate despite minor conflicting retail/database entries [2][3][4].
Expert 3 — The Source Auditor
The most authoritative sources are Miyota's own official product page (Source 1) and Miyota's own technical PDF (Source 2), both high-authority manufacturer documents: Source 2 explicitly states "Φ30.8" and "4.13mm" in the same specification table, directly confirming both dimensions of the claim, while Source 1 confirms 4.13mm height and the 13½ ligne size (which converts to ~30.8mm). These are independently corroborated by a third-party retailer (Source 3, Perrin) and a technical specification document from Gleave & Co. (Source 4), both listing 30.80mm and 4.13mm. The dissenting sources — Esslinger (Source 5) and EmmyWatch (Source 6) — are lower-authority retailer and database listings with no manufacturer backing, and their differing figures (30.5mm/30.45mm and 4.06mm) likely reflect mislabeled or variant listings rather than authoritative specifications; AliExpress (Source 7) is too low-authority to weigh meaningfully. The convergence of the manufacturer's own documents with two independent third-party sources on exactly 30.8mm and 4.13mm clearly confirms the claim as true, with the dissenting sources insufficient to overcome the manufacturer-level evidence.
Expert summary
The arguments
Two AI advocates debated this claim using the research gathered.
Argument for
The claim is directly and unambiguously confirmed by Miyota's own official product page and technical PDF (Sources 1 and 2), which explicitly state a diameter of Φ30.8 mm and a height of 4.13 mm — and these are the manufacturer's own authoritative specifications, carrying the highest credibility of any source in the brief. This is further corroborated by independent third-party retailers and technical documents in Sources 3 and 4, which identically list a diameter of 30.80 mm and a movement thickness of 4.13 mm, while the two dissenting sources (Sources 5 and 6) are lower-authority listings that appear to describe variant or mislabeled versions and are clearly outweighed by the convergent, manufacturer-backed evidence.
You're overclaiming what the manufacturer actually “explicitly” says: Source 1 (Miyota) gives 13 1/2''' and 4.13 mm but does not state 30.8 mm, so you're smuggling in a conversion and then treating it as unambiguous confirmation of the exact diameter. And you dismiss the contradictory measurements in Source 5 (Esslinger & Co.) and Source 6 (EmmyWatch) as “variant or mislabeled” without any evidence in the brief that multiple 0S10 variants exist, which is a classic ad hoc move rather than a rebuttal to the fact that not all credible listings match 30.8 mm/4.13 mm exactly.
Argument against
The motion is false because at least two independent listings contradict the exact dimensions: Esslinger specifies an outside diameter of 30.5 mm and thickness of 4.06 mm (Source 5, Esslinger & Co.), while EmmyWatch lists the diameter as 30.45 mm (Source 6, EmmyWatch). Moreover, even the pro-claim Miyota page emphasizes the size in lignes (13 1/2''') rather than explicitly stating “30.8 mm diameter,” so the 30.8 mm figure is not consistently supported across sources and appears overstated as a universal spec (Source 1, Miyota).
Your reliance on Sources 5 and 6 is critically undermined by their notably lower authority compared to Miyota's own official sources — Source 2, Miyota's technical PDF, explicitly states "Φ30.8" alongside the 4.13 mm height in the same specification table, leaving no ambiguity whatsoever, while Sources 5 and 6 are a retailer listing and a database entry that appear to describe mislabeled or variant units. Your claim that Source 1 only implies the diameter in lignes is a deliberate misreading, since Source 2 — also directly from Miyota — converts that exact ligne size to Φ30.8 mm, and this is further corroborated identically by Sources 3 and 4, meaning four independent sources converge on 30.8 mm and 4.13 mm versus your two lower-credibility outliers.