New surplus Aeroflash Signal Corp aircraft anti-collision light flasher unit, p/n A2DH85, which is 17-28V, and can be used as a single or dual beacon flasher. We’re not sure what aircraft it was used on but we suspect it was the Cessna T-41, L-19 or something similar. We believe these were manufactured for a military contract, and they are similar to Aeroflash part number 150-0008.