1987 Casio DB-31 Telememo 30 Module 871 Databank Watch Vintage NOS. Pristine NOS Casio DB-31 from 1987 (35 years old) Module 871; dual time, alarm, and databank storage; comes with original tags (no box or papers). Please feel free to check out my other items too, a lot of the watches I have will be rare and collectable and mostly NOS, ultimately very hard to find and in some cases may only be one of a few left in A1 condition. This item is in the category "Jewellery & Watches\Watches, Parts & Accessories\Watches\Wristwatches". The seller is "c3lm" and is located in this country: GB.