ANTRIM TOROIDAL MAINS TRANSFORMER.
I've had this in my box of bits for years, it has never been used.
Output windings are 21V x 7Amps
twin 8V x 2 amps
Last photo shows voltage measured, this is unloaded, ratings on the label will be loaded values.
230Volt AC input.
It has the clamping screw and washer also.