How old is a Deutzer Bros upright piano serial number 46223?

The provided serial number, 46223, doesn't correspond to the serial number format typically used by Deutzer Bros. pianos. Deutzer Bros. pianos typically have serial numbers starting with the letters "DB" followed by a series of digits.

Therefore, I cannot determine the age of the piano based on the given serial number.

To accurately date a Deutzer Bros. piano, it's best to seek information from sources like the manufacturer's records, piano encyclopedias, or by consulting with a piano technician/historian who has expertise in identifying and dating such instruments.