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Seiko 5 "SNK/SNXJ" 7S26 mod


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About Details and then some
Manufacture Seiko Seiko 5
Model reference “SNXJ/SNK” 7S26 caliber
Movement Automatic
Caliber 7S26
Dial Grey Sunburst From the SNK621
Case 36x42x11mm 7009 case back
Lugs 20mm
Bracelet G1341-E 18,5 cm
Crystal serial # Unknown Mineral
Timegrapher Amp 245 Err 0.6 Acc:+17/+24spd
Jewels 17
Serial # 27xxxx Production: 1992-07
Condition Excellent
Service Not required
Box & Papers No box No papers

The dial of this watch is from the Seiko SNK621, inside is Seiko caliber 7009 a SNXJ precursor automatic watch movement produced from around 1979 until 1996. The actual SNXJ line was discontinued in August 2014. There are some differences of course in that the 7009 has no display caseback and is therefore much flatter.

Inside the stainless steel case of the SNXJ line, you can find the revered Seiko 7S26 movement. This automatic caliber beats at 21,600 bph, uses 21 jewels and has about 40 hours of power reserve. While it isn't the most precise movement (-15 to +25 seconds per day), it is known for its durability. The 7009 on the other hand has 17 jewels and has better quality materials.