motorola TO3 puzzle

[zen mod]

first post ,and it's a question.......he ,typicall newbie  8) ;D

markings:

M (obviously Motorolla)
769521
259-4
7940



I know meaning of first and last lines,but rest.........?

anybody have some info?
datas,EU equivalent........



TIA!

[AN920]

Plant number
Batch number

[zen mod]

Plant number
Batch number

?
?

;)