GAGB Chelsea Colour Filter 1970s

This is an updated version of the 1958 GAGB Chelsea Colour Filter, with a newer shape of the case.  Based on the units accessible to the museum, the casing material appears to exhibit a strong yellowish discolouration for all units.

The exact date for this Chelsea Filter cannot not be found.  

This is a museum archives and no unit is available for sale at this moment.