I had a set of 755's when they first came out and although they let me down only a couple of times they were nowhere near as good as my trusted Cardinal 55's, mainly the build quality fell off the reel as the now once great ABU SWEDEN Cardinals were being made in Japan, like cars a lot of cheap plastic was involved, apart from the spools and the bail trips the rest of the Cardinal 55 was bullet proof.
The 755's did have good drag systems though I seem to remember but didn't internally take a hammering like the 55's.
While a bailiff for ARC I managed on 3 occasions 100 double figure carp in a day session (Did it in Holland also) fishing churners or slack drag settings and the 55's were faultless, my 755's were gone before the chance came along to do it again simply because they were not up to the job with lesser amounts of fish, these are of course just my thoughts, I do know others who love them.
Regarding the colour of the spools writings though? The Cardinal 57,55,54 & 52 do have spools identical to the 157,155,154 &152 and they fit each other perfectly, however the Cardinal 54 and its stable mates has gold writings on its surface where the 154 and its stable mates has silver writings, the gold and silver coloring goes with the sticker outlines on the side plates for those who wish to collect the genuine thing, the 54 spool also can at times command a high price on the bay of evil when you can actually find one.
