Brooks Competition B74 !? - Ever seen on before ?

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Hi, iv bought a second hand raleigh scorpio, it came with a Brooks Competition saddle.
Iv been trying to do some research into the saddle to see if its worth selling etc. It seems to be a 'B74' - which i cant find anything about online. Has anyone come accross them before ?
Some Photos . . . .
http://images.fotopic.net/yxo16h.jpg
+
http://images.fotopic.net/yxo16x.jpg

[more photos @ http://claf-y-bala.fotopic.net/]
Thanks
.np.