Seiko Presage Arita Porcelain SPB445J1 - 40.6mm

The SPB445J1 is a tribute to genuine Japanese craftsmanship. In the Presage Craftsmanship series, traditional Arita porcelain art meets modern 6R-generation watchmaking technology. The radiant white, relief-patterned porcelain dial is created in several stages from a particularly dense porcelain clay, fired at high temperatures, and glazed – resulting in the exceptional depth, brightness, and subtle sheen for which Arita has been renowned for centuries. Blued hands provide a precise, cool contrast and glide over the relief contours, creating a vibrant interplay of shadows and reflections depending on the light. Inside, the automatic 6R5H movement operates with a power reserve of up to 72 hours: a deliberately classic, mechanical foundation – combined with a dial made of genuine porcelain. Tradition and modernity in a purist, wearable format.

Technical Highlights

– Caliber 6R5H, automatic with manual winding
– Power reserve: approx. 72 hours
– Frequency: 21,600 A/h (3 Hz)
– 24 bearing stones
– Precision: +25 / −15 seconds per day
– 24-hour hand
– Waterproof up to 10 bar
– Sapphire crystal with anti-reflective treatment, domed on both sides
– Transparent, screwed-on case base

Dial & hands (Arita porcelain)

– Dial: Arita porcelain, white, with fine relief
– Appearance: bright white with a glassy depth effect, slightly iridescent depending on the light
– Advantages: more scratch-resistant surface compared to lacquer/paint; characteristic, gently rounded edges due to the firing process
– Hands: blued (dark blue) for maximum readability and classic contrast

Case & Glass

– Case: stainless steel (light grey look, polished/satin finish)
– Glass: Sapphire, domed; anti-reflective coating on the inside
– Case back: See-through case back (sapphire), screwed down

Bracelet & clasp

– Stainless steel bracelet
– Folding clasp with push button (safety folding clasp)

Dimensions

– Diameter: 40.6 mm
– Height: 12.46 mm
– Impact width: 20 mm
– Weight: approx. 150 g

materials

– Housing: stainless steel
– Bracelet: stainless steel
– Dial: Arita porcelain
– Glass: Sapphire

Condition

New, in original packaging

User manual (download)
You can find the official Seiko user manual here:
Seiko Customer Service – Instructions

Shipment
– In stock, available for immediate delivery. Free shipping within Germany.