G1900s Kubota serial number 50568 and would like to know the year it was made?

The Kubota G1900 series tractors were produced in the early 1990s. Based on the serial number 50568, it is likely that your tractor was manufactured around 1992 or 1993. For the most accurate information, you may want to check with Kubota directly or consult a dealer who specializes in vintage Kubota equipment.