They are great little beater watches, yours is quartz. Looks to have the original crystal(Hardex), and hands. The Seiko band is readily available on the web for $15 or so.....I'd switch over to a better quality Bonetto Cintirini, much more comfortable(not a hard rubber compound).
You can upgrade to a sapphire crystal, bezel ring, ect. if needed, parts are easy to get. I had my hands relumed with C3, upgraded crystal, full service...just to get her up to date.
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