1985 I bought my first one. I've worn the 50, 100, 150 and 300! My job was hard on them but I'm retired now. Casio hasn't made any in the last 10 years except the 32.  I need one with at least 100 in the databank (kinfolk numbers!) If this DBC150-1 hasn't deteriorated in any way while sitting on some store's shelf, you will appreciate it! Help me fuss at Casio so they will begin making them again!