Reference:bubbleback: Difference between revisions

Line 80:

== Two-piece case era (1936–1944) ==

~~In 1936~~ Rolex ~~simplified the~~ Bubbleback case ~~from the first-generation four~~-~~piece architecture to the two-piece form that carried through the rest of~~ the ~~line~~. Cal. 620 (subsidiary seconds) and Cal. 630 (sweep seconds) became the dominant automatic calibers, developed by Emile Borer at Aegler.

Rolex introduced a two-piece Bubbleback case with refs. 3131 and 3132 in 1936. Other references still appear in catalogues as three-body cases, including the 3134. Cal. 620 (subsidiary seconds) and Cal. 630 (sweep seconds) became the dominant automatic calibers, developed by Emile Borer at Aegler.

{| class="wikitable" style="width:100%;"

Line 87:

|-

| [[Reference:3131|3131]] || 1936–1948 || Cal. 620, 17j, sub-seconds || 32mm tonneau, 2-piece || First two-piece case Bubbleback; precious-metal only (9K/14K/18K YG & PG)

|-

| [[Reference:3134|3134]] || 1940s–1957 catalogue dates || 9¾-ligne automatic; caliber unresolved; subsidiary and centre seconds documented || 32mm tonneau, catalogued as three-body || Steel and steel/yellow gold documented; California-dial originality unconfirmed

|-

| [[Reference:3372|3372]] || 1938–1950 || Cal. 630, 17–19j, sweep seconds || 32mm tonneau || "Luxury Model" catalogue flagship; engine-turned bezel; widest dial variety of any Bubbleback (California, sector, salmon, champagne, silvered-gilt)

@@ Line 80: / Line 80: @@
 == Two-piece case era (1936–1944) ==
-In 1936 Rolex simplified the Bubbleback case from the first-generation four-piece architecture to the two-piece form that carried through the rest of the line. Cal. 620 (subsidiary seconds) and Cal. 630 (sweep seconds) became the dominant automatic calibers, developed by Emile Borer at Aegler.
+Rolex introduced a two-piece Bubbleback case with refs. 3131 and 3132 in 1936. Other references still appear in catalogues as three-body cases, including the 3134. Cal. 620 (subsidiary seconds) and Cal. 630 (sweep seconds) became the dominant automatic calibers, developed by Emile Borer at Aegler.
 {| class="wikitable" style="width:100%;"
@@ Line 87: / Line 87: @@
 |-
 | [[Reference:3131|3131]] || 1936–1948 || Cal. 620, 17j, sub-seconds || 32mm tonneau, 2-piece || First two-piece case Bubbleback; precious-metal only (9K/14K/18K YG & PG)
+|-
+| [[Reference:3134|3134]] || 1940s–1957 catalogue dates || 9¾-ligne automatic; caliber unresolved; subsidiary and centre seconds documented || 32mm tonneau, catalogued as three-body || Steel and steel/yellow gold documented; California-dial originality unconfirmed
 |-
 | [[Reference:3372|3372]] || 1938–1950 || Cal. 630, 17–19j, sweep seconds || 32mm tonneau || "Luxury Model" catalogue flagship; engine-turned bezel; widest dial variety of any Bubbleback (California, sector, salmon, champagne, silvered-gilt)