Identify the exact model, variant and period before discussing value

Before assigning a period or value, identify the full model, variant, intended market and plausible production range as accurately as possible.

Compare visible features, labels, panels, logos, known specifications, components and documentation. Avoid starting from a broad marketing name when meaningful revisions exist.

Specifications can change gradually during production; not every transition coincides with a new model name or catalogue year.

If some elements remain uncertain, say so. A cautious identification is more useful than an exact date built on weak evidence.