Differences

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--- seiko_4r15 [02.12.2022 20:38] – created - external edit 127.0.0.1
+++ seiko_4r15 [03.12.2022 13:57] (current) – gerdlothar
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+====== Seiko 4R15 ======
+**4R15** and **4R16** are two related [[automatic]] upper-midrange watch movements from [[Seiko]].
+===== Overview =====
+The 4R15 family was introduced in [[2008]] as mainstream automatic watch movements for Seiko watches. It is based on the [[hacking]]/[[hand-winding]] [[Seiko 6R15]] but lacks these advanced features. Both of these movement families are based on the basic [[Seiko 7S26]] movement, and all share some components. Unlike the 7S26 family (and the hacking/hand-winding brother, [[Seiko 4R35|4R35/6/7/8/9]]), the 4R15/16 have a long 50 hour [[power reserve]] thanks to an advanced [[Spron]] 510 [[mainspring]]. This is shared with the 6R15 as well.
+===== Variants =====
+Like most Seiko movements, the 4R15/16 family operate at 21,600 A/h. All models feature sweep hour, minute, and second hands. The 4R15 features a date window, while the 4R16 has both day and date in a window. Both have 22 jewels.
+^Movement ^Beat ^Hands ^Date ^Subdial ^Jewels ^Power reserve ^
+|4R15 |21,600 A/h |Hour, minute, seconds |Date |None |22 |50 hours |
+|4R16 |:::|:::|Day and date |:::|:::|:::|
+===== Applications =====
+The 4R15 and 4R16 are used in many Seiko "[[Seiko Superior|Superior]]" watches, most in the "[[Seiko SRP|SRP]]" model series. These featured upmarket features from the common [[Seiko 5]] line, such as sapphire crystals and metal bracelets with solid end links.
+{{wst>template_seiko_7s_family}}
+===== External links =====
+  * [[http://watcharama.com/the-seiko-4r36-family-in-brief/|Seiko 4R36 -The Family In Brief]]
+  * [[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]]
+  * Rapid calendar advance
+**Data:**
+  * 22 [[jewels]]
+  * 21,600 A/h
+  * Power reserve 41 hours
+  * [[Spron]] 510 mainspring
+**Production period:**
+  * [[2008]]-Present
+</WRAP>
+{{tag>Movements Automatic_movements Seiko_calibres}}