Looks like a 7.5' dish to me. All of the 7.5' dishes I've had the feedhorn supports attach to the rim of the dish like that. All of the 10' dishes I've had the supports are inboard of the rim by about 8-10" or so.
Are you asking about a dual C-Band LNB feedhorn with no polarity servo like a Bullseye? If so it is possible not to have a skew controller with that particular feedhorn using two LNB's.