No perfs on the genuine, that's the outer frameline which may or may not show scalloping/waviness.
Here's what look like genuine ones scattered through the Buenos Aires listings:
https://www.stampcircuit.com/catego...aires?page=1As for margins, these stamps are apparently very close together on the sheet, enough so that 4 margin copies are very tough to come by.
Album Weeds:
http://stampforgeries.com/album-wee...uenos-aires/There are reprints, too.