I recently saw this thread, and I did some further reading. It appears that Allegion (the parent company behind Von Duprin and Schlage) later updated the 1910 series to include first-generation SpectrAlerts. Notice that the date on this datasheet is May 2024, and the horns are also listed on this webpage.
There is also this install manual from 2013, which has the same model numbers but is clearly a SpectrAlert Advance in the photos. Additionally, the manual claims the average current draw is 28 mA, which is much less than a SpectrAlert Advance or even a Classic horn strobe but possibly the current draw of a Classic standalone horn.