Sugino Mighy 900/Impel 700 compact crank...

My uncle may still have a pretty good set of impul 500 cranks up in his closet. if you are interested i'll inquire
 
I have some Impels - how do I know if they are 700, 900 or other - would they say? All it says is Impel on the front at least (haven't looked round the back yet).
 
Pics. They are 175mm BTW.

spa0748.jpg


spa0746.jpg
 
according to the kona catalogue in 1994, an impel 700 chainset weighed 600g....
 
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