Reference:bubbleback: Difference between revisions

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| style="width:33%; padding:14px; background:#f8f8f6; border-left:3px solid #555; vertical-align:top;" | ''Identifying a first-generation Bubbleback?''<br/>'''[[Reference:1858|1858]]''' — the first Bubbleback. Cal 520 with the full 360-degree rotor, the Didactic engravings in French on the movement plate, and the four-piece case form.

| style="width:33%; padding:14px; background:#f8f8f6; border-left:3px solid #555; vertical-align:top;" | ''Cross-checking a two-piece case Bubbleback?''<br/>'''[[Reference:3131|3131]]''' — first two-piece case Bubbleback. The 1936 case simplification, precious-metal only (9K, 14K, 18K yellow and pink gold), Cal 620 with sub-seconds.

| style="width:33%; padding:14px; background:#f8f8f6; border-left:3px solid #555; vertical-align:top;" | ''Working from a Luxury Model dial photo?''<br/>'''[[Reference:3372|3372]]''' — the catalogue flagship. Engine-turned bezel, Cal 630 sweep seconds, and the widest dial variety of any Bubbleback — California, sector, salmon, champagne, silvered-gilt all documented.