Grimeca hubs

do you know if this is left hand or right hand please. it is very similar, no cooling holes etc but I think it looks r/h. or something about the levers.
just looked at photos of the GT, strange that some have the cooling holes and some don't, any reason for that? 1970 one didn't. other than that the l/h side is correct for what I am matching if they are all tls
 
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