Avro control yoke serial number 87BR – what does it tell us?

Hello,
stamped onto the back of an Avro lanc/Lincoln yoke I’m researching is the serial number 87BR.
I’m interested to know what the code might tell me in terms of manufacturer, date of manufacture, etc.
Incidentally, the column to which the yoke is attached also has two numbers that I can make out. Bolt – km 12a2282. Housing – 6(5 or s)r2085.
Any help would be much appreciated.
Dave