The difference between Cal.4R35 and Cal.4R36 is a calendar mechanism” – source Since the size of the movement is same as A series, the complete movement can be assembled into the watches which originally have the A series movement however, as the parts are not convertible, please use the appropriate parts for each caliber. Construction of B series are same as A series, but using new parts. “SEIKO Automatic Mechanical Cal.4R35B is replacement caliber of Cal.4R35A. Seiko has even updated their tech sheets with more information regarding the difference between A vs B. Update: It appears that the parts lists for the 4R35A and 4R35B show a difference of at least 23 individual parts. Power Reserve: 4R35A = 41 hours / 4R35B = 40 hours.Lift Angle: 4R35A = 52 degrees / 4R35B = 53 degrees.Other differences as listed in the technical docs: This happens to be the same jewel count at the 4R36 mentioned above, so it could be for ease of production and documentation. The official tech sheets show that the 4R35B was an upgrade from the original caliber where Seiko increased the jewel count from 23 to 24 jewels see update below. The “A” in 4R35A indicates that it is the first generation of this caliber. Despite tech sheet misinformation, the caliber 4R35B has 23 jewels and the 4R36A has 24 jewels (see below). Everything else is the same, including dimensions, jewels, accuracy, etc. The difference between the two is that the 4R35 has a date calendar complication at 3:00, and the caliber 4R36 has a day/date at 3:00. At the time of this post, the 4R35B has 23 jewels and the NH35A has 24 jewels (see below). Seiko Instruments (aka SII) sells the NH35 to other manufacturers for use in non-Seiko watches. The caliber 4R35 is basically a Seiko-only version of the NH35A. Some of the topics covered in this caliber listing: Second hand stop function for time setting (2nd click position of the crown).” 6R series design with two specifications as follows: ́. This caliber was considered to be an upgrade from the popular 7S26 movement as it offers the user the desirable hacking and hand-winding functionality. The Seiko caliber 4R35 is an automatic used by Seiko Watch Corp. Hours, minutes, central seconds, date calendar at 3:00
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