It is very easy to identify which clutch you have.
The wet clutch shaft has only one groove on it to lubricate the clutch bearings.
The dry clutch shaft has two grooves , one to lubricate and another one for the oring.
Check the pics at the links below.
http://i5.photobucket.com/albums/y190/Jezza_NSR/Motorcycles/Miscellaneous/NSR_gearbox.jpg
http://nsr250spares.files.wordpress.com/2012/02/09022012062.jpg
Cheers
Stefanos
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Owner of : Honda NSR250 MC28 95sp colours / Honda NSR250 MC18 R6K SP / Honda RS250 NF5 89 in boxes
/ Honda C50 12V cub / Honda C50 12V super cub Japanese version /Yamaha XT600 89 benetton