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+====== Seiko 4R35 ======
+**4R35** is one of a family of related [[automatic]] watch movements from [[Seiko]]. Other closely-related members of this family include the **4R36**, **4R37**, **4R38**, **4R39**, and **4R71**.
+===== Overview =====
+The 4R35 family was introduced in [[2010]] as a mainstream automatic watch movement for Seiko watches. It is distinguished by the fact that, unlike earlier mass-market movements like the [[Seiko 7S26]], the 4R3x family [[hacking seconds|hacks]] and [[hand winding|hand winds]]. It is cost-reduced from the [[Seiko 4R15]]/[[Seiko 6R15]] (upon which it is based) and [[Grand Seiko]] models, including not using a [[Spron]] 510 [[mainspring]].
+Cal. 4R35 was introduced in [[2010]] in the [[Seiko Presage|Elegant/Presage]] [[Seiko SARY|SARY series]], and these remain in production. It was later used in the [[Seiko Prospex|Prospex]] [[Seiko SBDY|SBDY Diver Scuba]], [[Seiko SRPC|SRPC]], and [[Seiko SRPD|SRPD]], and the [[Seiko Premier|Premier]]/[[Seiko Presage|Presage]] [[Seiko SRP|SRP dress watch]] and [[Seiko SRRY|SRRY Ladies]] lines. Two notable watches with Cal. 4R35 are the [[Seiko SSVM|SSVM]] [[Seiko Lukia|Lukia]] and [[Seiko SBDY|SBDY001]] [[Seiko Prospex Fieldmaster|Prospex Fieldmaster]].
+Cal. 4R36 was next to be introduced, in [[2011]], in the [[Seiko 5]] [[Seiko SARZ|SARZ line]]. It was later used in the [[Seiko SRP|SRP]] [[Seiko Monster|Monster]] and similar and [[Seiko Prospex|Prospex]] [[Seiko SBDY|SBDY Diver Scuba]]. Cal. 4R37 appeared in [[2012]] and is much rarer, appearing only in a few [[Seiko SARY|SARY]], [[Seiko SARZ|SARZ]], and [[Seiko SSA|SSA]] models. Most of these use Cal. 4R38 instead. Cal. 4R39 was also introduced in [[2012]] in the [[Seiko SSA|SSA line]].
+Cal. 4R57 is only used in [[Seiko Presage|Presage]] models in the [[Seiko SARY|SARY]] and [[Seiko SSA|SSA]] lines. It was first issued in [[2016]]. Cal. 4R71 is the rarest, only used in the [[2018]] [[Seiko SSA|SSA Premier Automatic]].
+[[As of 2019]], the 4R35 is used in the [[Seiko SRP|SRP family of watches]], Seiko's second tier above the [[Seiko 7S26|7S26]]-powered [[Seiko SNK|SNK series]]. Cal. 4R38 and the newer 4R71 is also used in the [[open heart]] [[Seiko SSA|SSA series]]. The next series, [[Seiko SBD|SBD]], uses the [[Seiko 6R15|6R15]].
+===== Variants =====
+Like most Seiko movements, the 4r3x family operate at 21,600 vph. All models feature sweep hour, minute, and second hands. The 4R37 and 4R39 add a [[24 hour]] subdial, while the 4R35 and 4R37 feature a date window and the 4R36 has both day and date in a window. The 4R35 has 23 jewels while the 4R36, 4R37, 4R38, and 4R39 all have 24 jewels. These movements have a [[power reserve]] of approximately 41 hours, according to Seiko. Cal. 4R71, introduced in [[2018]], is designed for use in [[skeleton]] dial watches but is otherwise similar to Cal. 4R38.
+The **4R35A**, which had 23 jewels, was revised shortly after introduction with one extra jewel, becoming the **4R35B**.
+^Movement ^Hands ^Date ^Subdial ^Jewels ^Power reserve ^
+|4R35A |Hour, minute, seconds |Date |None |23 |41 hours |
+|4R35B |:::|:::|:::|24 |:::|
+|4R36 |:::|Day and date |:::|:::|:::|
+|4R37 |:::|Date |24-hour |:::|:::|
+|4R38 |:::|None |None |:::|:::|
+|4R39 |:::|:::|24-hour |:::|:::|
+|4R71 |:::|:::|None |:::|:::|
+{{wst>template_seiko_7s_family}}
+===== External links =====
+  * [[http://watcharama.com/the-seiko-4r36-family-in-brief/|Seiko 4R36 -The Family In Brief]]
+  * [[http://www.seiko-watch.co.jp/resource/pdf/manual/BSB4R3C-A1106_web.pdf|Seiko 4R35, 4R36, 4R37, 4R38, 4R39 Manual]]
+  * [[https://reference.grail-watch.com/family/seiko-4r/|Seiko 4R Family Reference]]
+<WRAP ud ud_mov>
+**Description:**
+  * [[Automatic]] movement
+**Functions:**
+  * Hours, minutes, seconds
+  * [[Central seconds]]
+  * [[24 hour]] subdial
+  * Rapid calendar advance
+  * [[Manual winding]]
+  * [[Hacking seconds]]
+**Data:**
+  * 23 or 24 [[jewels]]
+  * 21,600 A/h
+  * Power reserve 41 hours
+**Production period:**
+  * Since [[2010]]
+</WRAP>
+{{tag>Movements Automatic_movements Seiko_calibres}}