Looks like a
CDI furler with the integral (built in)
halyard. I don’t think they are made anymore.
A good replacement (with integral halyard) would be the Brazilian made “Alado Furler”.
If you have a spare separate (non integral)
halyard rigged on your
mast, you could probably replace that furler with just about any other regular one (eg profurl, Schaefer, etc)