These postcard images speak for themselves.  Both were unsent.  Lovely Sierd Jan Tuinstra, who is an absolute fount of knowledge about Aberdovey, has provided the following information, with my sincere thanks:

As to their date, they were both taken on the same day during the same flight. Probably sometime in the 1920’s . They pop up on eBay every now and then, and I have a slightly different copy of the top card a few years back, which was posted in 1928.  There is a third view from the same flight.

Commercial air photography didn’t exist prior to 1919. But after the war, ex RAF reconnaissance officers started the air photographing business using their hard won knowledge and experience.

I instantly noticed the railway wagons in the three postcards. Two of them can be readily recognized as Great Western wagons, thereby dating the view to after 1923. In every one of the postcards their position and that of the other wagons is exactly the same, meaning that all three views must have been taken on the same day.