I recently fitted some new pedals on a friends bike and ended with the old Shimano SPD double sided pedals to get rid of. As they were in good shape I thought I'd sell them so tried to find them model number for the advert - no luck! There's nothing written on the pedals apart from Shimano, they are double sided SPD's (they fit my shoes ok) and are quite heavy cast construction. I've searched on Google images for something similar and cannot find a single image that matches. I was wondering if they were old, I think SPD arrived in 1990 could they be that old?. Any help to identify appreciated. Picture attached.