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Cosmic 2000s are decent, sturdy watches. Although they have a difficult-to-open case construction, making servicing more challenging (not all watchmakers will agree to service, as there is a risk of damaging the dial). Inside mine is a cal 1012 which is going strong, although not a highly sought after calibre.
The case and design are very 1970s...you either like that or not.
Cosmic 2000s are generally not prized by collectors for the aforementioned issues, reflected in a lower price.
More photos are needed to assess whether asking price is ok 😕. It seems perhaps a bit high, but if properly serviced, maybe ok?
It looks heavily worn, the bracelet may well be lose, particularly at the case. The inscription has worn away the hippocampus on the caseback.
Personally, I'd wait for a better example... they come about frequently. If you do buy, make sure you're happy that it has actually been serviced properly (as per @Davidt advice).