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@31trum
There are a few, 300m, 600m and the 1000m
also called the Tuna or hockey puck
https://www.google.co.uk/search?q=seiko+puk&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjxqanqpdXMAhUsI8AKHS-yAyQQ_AUICCgC&biw=819&bih=652#tbm=isch&q=seiko+tuna