Yes it's not Pista but it is mounted on a pista bike (belonged to Moser). So the problem is double: fake panto e corsa stem on a bike belonged to Moser. Moser uses pista stem.
google translate is not so efficient ;-) I think pista stem gives the right look.
the stem on the benotto does not look like pista at all (angle)
the fourth bike is a hungarian bloke's track bike, here's the article he wrote on it:
http://revomag.hu/2013/regi-idok-bicaja-f-moser-leader-pista/
you can throw it in google translate :)