More than 400 letters were delivered to eligible islanders on Saturday morning.
The government says the Contact Centre received a steady stream of calls over the weekend.
The Vaccine Contact Centre manager is reminding islanders they the service is open seven days a week.
The staff working over the weekend received calls from delighted islanders who were keen to receive the vaccine as soon as possible. Callers were also keen to take the earliest available appointment and were clearly prioritising this over their other commitments.
Toni Airley, Vaccine Contact Centre Manager
Those who are aged 75 and over and did not receive a letter this weekend are due to be sent one this week.