I saw the 2011 Seiko catalog for international models and was surprised to see the 4R movement being the main movement used in the automatic models including the Seiko 5. The 4R movement will come in several variations:
4R35 – date
4R36 – day and date
4R37 – 24hr sub dial at 11 or 12 o’clock position, date
4R38 – open heart at 9 o’clock position
There are some 7S based Seiko 5 models on the catalog but I suspect the movement will slowly be discontinued.
Before that happens, let me share with you yet another 7S36 Seiko 5 Sports model that many may not have seen before.