Wasn't too sure where to post this. I am new to the forum, and I'm on a small mission. Due to recent events some old photos of my Grandfather have surfaced which show him atop a BSA bike. I was hoping someone here would be able to identify the model for me, as I'd like to find out more about the bike, and if the stars align, purchase one.

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From my (extremely) limited knowledge, the closest example I could find with the power of Google was an Empire Star.

Any help would be most appreciated. Some amazing looking machines in here.