I am not good at identifying camellias but it reminds me of October Affair, a Camellia Japonica.

Here is a link that might be useful: Camellia October Affair

Are you familiar with (Guest Star(?

Here is a link that might be useful: Guest Star

Only when I was looking at camellia pictures at the American Camellia Society's Website. Those two camellia blooms are very similar. Reminds me when I was looking at the pictures. By the time I got to camellias whose name starts with a G, I was swearing I had already seen this or that one before.

It would be nice if there was a source that included more than just one picture of the blooms as well as the shrub. One might notice differences more clearly that way.

Yes: With C. japonica cultivars flowers of same kind may vary quite a bit right on the same bush, as well as on different planting sites.

And there have been thousands of kinds named, some of them closely similar.

Looks similiar to Camellia japonica Grace Albritton.

Here is a link that might be useful: CamelliaWeb Gallery 'Grace Albritton'