Poseidon had the first single hose scuba regulator with the 2nd stage at the mouth, back around the mid 1950's or so. Their original reg was very similar to the Cyklon.
The design on the 2nd stage hasn't changed much for over 30 years, attested to by being able to use the same 2nd stage rebuild kits on the 300 as the newer 5000. The 2nd kit consists of a couple o-rings, a little rubber plate, and a new zip tie for the mouthpiece.
They're an extremely robust & hardy regulator, & the first single hose to come out with antifreeze protection.
Not too long ago a Cyklon was found laying on the bottom attached to a rotted out pony bottle. The rig had been down for over 2 years. The reg was rinsed out & the darn thing not only still worked w/o any tinkering, but all that was required to put it back into service was a simple normal service kit.