Curious about an old Zenith B&W TV

Hi:

In the basement of a house I bought this year, the previous owners (an older couple), cut out a hole in the club basement paneling and put a Zenith B&W TV in the utility area so the screen shows through into the clubroom area. It's a Zenith model D2430RU. Does anyone have any idea how old this TV might be. It fires up and does display a picture. Just curious about it's age.

Thanks:
Brian