I think this image is originally in color, very cool to see non-desert colored tanks in the desert.
Osprey's
Italian Medium Tanks '39-'45 says that they are M13/40s of VII M tank battalion in Libya, March 1940. They were probably transferred from the Balkans since they're still in their green/grey paint (I assume they were soon over painted with desert yellow).
The side markings show it's the first tank of the first platoon of the first company.