Here is the AQUALUNG XL released in 1986, it is new in its box. This very good piston regulator was marketed to compete with the MK10 -R190 from SCUBAPRO.
Here is the AQUALUNG R only produced in 1986, so it is a difficult part to find. It is a 50/10 type metal second stage but with a plastic cover and push button type XL box.
This is the 1991 version of the AQUALUNG with this famous plastic cover of the same type as that of the SPIRO CLUB released the same year. May be practical to purge with gloves this version will be quickly abandoned.