Case 25 — Comparison thread: 38mm vs 40mm versions of the same field watch, with a dated correction log
Summary so far. Rows: diameter, lug-to-lug, thickness (method stated), lug width, crystal type, water resistance (as specified), movement family, production period. Each row has a source tag. Corrections go in the dated log with old and new values. If nobody objects, that's the template, and later posts should give evidence rather than restate opinions.
Case 31 — Crystal types: sapphire, mineral and acrylic trade-offs for daily wear
On anti-reflective coatings: inner-surface AR cuts glare without wear concerns. Outer-surface AR improves legibility further but can scuff over time, and the scuffs show up as hazy patches in certain light. When comparing two watches, check which surfaces are coated. Spec sheets often just say 'AR coated' without saying where.
Case 21 — Timegrapher reading context: what do rate, amplitude and beat error actually tell me?
Amplitude depends on the movement and measurement setup. Compare it with appropriate specifications and a qualified watchmaker’s assessment; a universal pass/fail threshold would be misleading.
Case 212 — Date window centring: compare the same date at the same angle · correction exercise
Different numerals have different optical centres. A comparison mixes two dates and unequal magnification. How can the evidence be improved?
Review focus: correction. Preserve the old wording if a later source changes the interpretation. Use the original answer fragment “Keep the uncropped originals alongside the detail crops and distinguish…” as the discussion anchor; no new event or result is supplied.
Exercise RWF-25905/212: address this question within its stated limits.
The core trade-off is scratch resistance versus shatter resistance. Sapphire is very hard to scratch but can chip or crack from a sharp impact on an edge. Acrylic scratches easily but flexes, rarely shatters, and light scratches can be polished out at home. Mineral glass sits in between and is often the cheapest to replace.
Case 25 — Date window centring: compare the same date at the same angle
Summary draft for “Date window centring: compare the same date at the same angle”: the answer addresses “Use the same numeral, camera axis…”; the related point is “Keep the uncropped originals alongside the detail crops and distinguish…”. Keep both connected to the opening question, and mark any conclusion needing further records as unresolved. Review focus: scope. Keep the stated question separate from any broader claim.
Case 29 — Lume comparison: keep exposure and charging conditions consistent
Treat the comparison as inconclusive. Repeat with equal light source, charging duration, elapsed time and camera settings; disclose conditions rather than assigning an unsupported quality score.
Case 47 — Movement identification: the limits of a rotor photograph · source wording exercise
Correction note for “Movement identification: the limits of a rotor photograph”: retain the wording beginning “Ask a qualified watchmaker to inspect it if identification matters for…” in the record. If later material changes it, add the date, the changed wording and the source for that change; do not invent a completed correction here. Retain the source wording beside any paraphrase.
Case 34 — Strap compatibility: width is only the first measurement
Two straps share the same nominal width but differ in thickness and spring-bar clearance. Which dimensions need checking?
Exercise RWF-18708/34: address this question within its stated limits.
Case 14 — Clasp photographs: what to request before judging alignment
Method note for “Clasp photographs: what to request before judging alignment”: use “Request open and closed views from both sides,…” as a row heading in a proposed working record. Put the statement, its supporting source or measurement, and any unresolved detail in separate fields. This proposes a format; it supplies no additional evidence. Keep the stated question separate from any broader claim.
Case 16 — Lume comparison: keep exposure and charging conditions consistent
Two glowing dials are shown with different camera exposure and unknown charging time. What can the images establish?
Exercise RWF-16063/16: address this question within its stated limits.
Use fields for order date, promised terms, dated communications, delivery evidence and resolution. Leave unsupported fields blank and separate observations from opinions; this reference is not a seller endorsement.
Correction to a common shortcut: don't measure lug width on an existing strap. Leather and rubber straps compress or swell, and some are made slightly undersized on purpose. Always measure between the lugs themselves, with the strap removed if possible.
Case 21 — Magnetism and rate: record evidence before naming a cause
Method note for “Magnetism and rate: record evidence before naming a cause”: use “Record the change and the circumstances without treating…” as a row heading in a proposed working record. Put the statement, its supporting source or measurement, and any unresolved detail in separate fields. This proposes a format; it supplies no additional evidence. Keep the stated question separate from any broader claim.
Clarification for “First QC request: the minimum useful information”: the point beginning “State the model configuration, the specific concern and…” belongs to the question as written. It should not be read as a report that a new check, purchase or experiment has been completed. Review focus: scope. Keep the stated question separate from any broader claim.