Logo: BSA Logo
B40FT B40 Military - 1965
B40GA WD B40 Australian Army MK 1 - 1967
B40GB WD B40 British Army MK 1 - 1967-70
B40GN WD B40 British Navy MK 1 - 1969
B40GR WD B40 British Air Force MK 1 - 1968 - 70
B40M B40 Military MK 2 - 1968-69
B40GD WD B40 Danish Army MK 1 - 1967-68
B40GD WD B40 Danish Army MK 1 - 1969-70
From 1969 onwards date prefixes were added.
The first letter denotes the month:
The second letter gives the year from August to July:
Image: BSA WD B40 Engine
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