Xuan, it seems to be an heirloom hybrid.

Notice the purple anthers before they split; this is characteristic of H. aulicum. Also, see the dark eye surrounding the filaments in the throat? This character is usually passed down from H. vittatum.

I think this is possibly a second generation hybrid between those two.

I know this isn't an I.D. and of course it is just speculation!

Josh

Many thanks for the information, Josh. Really appreciate it.

Xuan

It is a heirloom. I even concour with the assumption of H.aulicum parentage. The florets show very upright. Do they do this on this picture only, or on every occasion? I love this. Generally, the property "upright blooms" goes, totally lost in the offspring!

H.aulicum:
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Many thanks, Sir Hans.

Yes, all the four blooms on the stalk face upward, very different from other amaryllis. Here's another photo of the blomming stalk.

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I've just bought the bulb recently so I'm not sure if this habit will change in the future or not.

Xuan

That thing looks good.
Actually, flowers from bulbs, that had been freshly purchased and produce blooms from largely insufficient root remainders, temd to have very SHORT PEDICLES and then the florets are being crowded to form a closed umbel as is shown in your picture.
I shall now search in my album, for a TRIPloid GENUINE primary hybrid in regard to H.aulicum to show how "upright florets by aulicum parentage" might look.

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H.aulicum v.robustum x ("Donau" x "Ambiance")

Many thanks, Sir Hans, for your interest in this. That's very kind of you towards novice gardeners like me.

Xuan