I guess the guys making up the page, would have realised they were laying the picture the wrong way round, if there had been a number on the front plate - or - maybe the art director didn't like the direction the bike was facing, so told them to blot out the number and reverse the picture - "nobody will notice"!
I was watching a program on ww2 in Malta there was a picture of a chap walking over some rubble with him on the left of the picture later they showed the same piece of film this time he was walking on the right of the picture poetic licence then
I suppose that gearbox will be one down and three up with reverse gears only, it'll be wired positive earth and the ignition timing will be 7/16 atdc fully retarded.... ...Ian