Any idea what year approximately

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Hi guys I've just come across this at an antiques fair has anyone got any idea approximately what year or decade is this from ?
It cost me £45 I put a battery in it and it runs fine 79090dc765b65da63854c2f148295cff.jpg 515066e938398b7282cd8db1017aad3e.jpg

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Edited:
 
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Better photos d3d8cd9ba88cdab879314a30003acd6d.jpg d97b155df44a81266ddc667753c00139.jpg 3523f73876020c200a666fc683d8f5ca.jpg 5c519ac1d4bb06c83d8bef08308dc692.jpg

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Just look at the case back and look for the four digit number aka the caliber
 
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I second it being from the 1980s most likely 1977-86ish
I presume with it being quartz it's not worth very much