David Sear does list that coin type in volume IV, (copyright 2011) #12715, Siscia, AD 288, in EF condition for $130. He also lists a more common variety without Victory in the center, #12714, Siscia, AD 286-8, in EF condition for $50. Considering those prices are 8 years old, a value of 3 to 4 times his listed price doesn't seem out of hand, but $1600 seems a little rich for my taste !
Being a generalist collector, I certainly wouldn’t pay the hammer price for the coin. Maybe 200 euro tops. It’s a beauty, but very similar coins can be had for a fraction of the price in the same condition. Perhaps the rarity + appeal was of interest to - more than 1 - specialist in the area, thus a bidding war. 64 bids is an awful lot of interest in any particular coin, let alone an LRB. The very best examples of any coin can sell for multiples of the expected price as Connoisseurs with deep pockets compete for the top 1% of specimens
All the important points have been made already. Value is both subjective and relative. If you need this type, you value it higher and if you are rich, 1600 euros may be peanuts to you. Clearly it is a rare coin and what is most important, it is extremely appealing. Even with common types, condition and style can multiply the price.