possibly 'kramer's supreme' or 'kramer's beauty'. 'supreme' produces very large buds and flowers on my shrub, usually bending the stems downward with the weight of the blooms. it is normally later to flower than most of the others i grow.

Thank you for your response. Judging from pictures on the internet, I believe it looks more like Kramer's Supreme.

Yes, that looks like my now blooming Kramer's Supreme. It can bloom in late December or early January for me but this year, we got hit with very cold temps in January that delayed blooming until two weeks ago. Enjoy the blooms martys!