=Nightingale Modem by PACE=
A 300 /1200 baud modem sold with, or designed to be used with the RS232 unit (below), both made by PACE using Commstar software.
Below pictures and video show the unit connected online to Arcade Demon in 2013, the last BBS operating in the U.K. (as far as aware) compatible with an Amstrad CPC. The site was aimed at Acorn users, and stopped updating around 1995.