My very first "proper" reel was the 444. I was so chuffed I had a reel that came with its own case!! I sold it a number of years ago for a fiver to a chap just starting out.
I have the full set of Ryobi Magnesium reels and a few spare spools, all bought from Richard Walkers in King Street.
I have the 355, the 357 and the 455 which was the 4" salmon reel.
Only issue I ever had was the steel pin that holds the check pawl in place worked loose on one of them, otherwise, bomb proof, simple reels that were incredibly light.
As Hamish says, the 444 was a cast aluminium reel with a single check pawl, the MG reels (Magnesium) were half the weight and came with two check pawls, meaning you could convert from left to right wind easily. Adjustment is via a small knob near the reel foot. Quite narrow spools compared to modern reels.