is this a tritium watch, which glows in the dark, or do you have to put the watch in direct light first before it shines at night?

Seiko does not make any tritium watches. The quality of the "glow paint" they use is good, but can not touch tritium in extended night (lack of light exposure) usage.

Does this watch have a sweep second hand, similar to most mechanical watches?

This watch has a 21,600 vph movement, the 7S36 (although some places list a 7S26c). It beats a bit slower than (and thus the sweep is slightly jerkier than) many of the midprice and higher automatics out there, which typically run at 28,800. It's sweepy, but the increments are more noticeable than on one of those watches.

Is the movement hacking? Does the second hand stop when the crown is pulled out?

The second hand doesn’t stop when the crown is pulled out

If the watch is stopped, how long of normal movement does it take to get it going? If the watch is fully wound, how long will it run standing still?

It doesn't take much movement to get it ticking again after its reset. With a full wind it gets me through the night. However, there's no way to know when it's fully wound and there was a couple times it stopped in the morning before I woke. It made me about a half hour late to work one morning so i don't wear it to bed anymore!

Seiko Mens Snzg15 Seiko 5 Automatic Stainless Steel Watch Nylon

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

⌚ Own the moment with timeless style and unstoppable performance!

100 M WATER RESISTANCE - Ready for swimming and snorkeling—wear it anywhere, worry-free
VERSATILE NYLON STRAP - Comfort meets rugged style with breathable, adjustable buckle closure
LUMINOUS HANDS CLEAR DIAL - Bright glow-in-the-dark markers for instant readability anytime
EFFORTLESS AUTOMATIC MOVEMENT - Self-winding mechanism keeps you on time without battery fuss
ROBUST 42 MM STAINLESS STEEL CASE - Striking presence with durable hardlex crystal for everyday resilience

The SEIKO Men's SNZG15 is a 42mm automatic stainless steel watch featuring a hardlex crystal, luminous hands, and a day/date window. Its durable nylon strap and 100m water resistance make it perfect for active professionals seeking a stylish yet rugged timepiece that keeps pace with their dynamic lifestyle.

Specifications

ASIN	B006I22GT2
ASIN	B006I22GT2
Additional Features	Glow In The Dark
Age Range Description	Adult
Band Color	Silver
Band Material Type	Nylon
Band Width	22 Millimeters
Bands	1
Batteries	1 A batteries required. (included)
Best Sellers Rank	#5,166,220 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #16,086 in Men's Wrist Watches
Brand Name	SEIKO
Case Diameter	42 Millimeters
Case Material Type	Stainless Steel
Case Thickness	11 Millimeters
Clasp Type	Buckle
Closure Type	Buckle
Crystal	hardlex
Customer Reviews	4.3 4.3 out of 5 stars (751)
Date First Available	November 22, 2011
Department	mens
Dial Color	Black
Display	Analog
Embellishment Feature	Crystal
Face Style	Round
Global Trade Identification Number	00664689183647
Is Discontinued By Manufacturer	No
Item Weight	75 Grams
Item model number	SNZG15
Manufacturer	Seiko
Manufacturer	Seiko
Manufacturer Part Number	SNZG15
Model Name	SNZG15
Model Number	SNZG15
Package Dimensions	4.9 x 4.8 x 3.4 inches; 2.65 ounces
Pattern	Solid
Power Source	Automatic
Series Number	15
Shape	Round
Sport Type	Swimming, snorkeling
Strap Type	Nylon Strap
Style Name	Sport
Theme	Sports
UPC	029665158611 664689183647
Warranty Type	Manufacturer
Watch Movement Type	Automatic
Water Resistance Depth	330 Feet
Water Resistance Level	Water Resistant

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