At Mars ( Mike and Allan's Reel Service) we receive all sorts of different reels. I hope to put up a picture showing an Abu Garcia Fixed Spool called a D4. The clutch is located on a dial ring located under the reel with nos. 1 to 10 on it. Internally, parts are quality stainless or metal and quite heavy by today's standards. Some of the Abu Garcia reels in mint condion from the 60's and 70's are fetching thousands in the States. From the picture, it can be seen that this classic reel has very few parts.
The second picture shows a modern big Pit Reel used by Carp Anglers with a bait runner feature which has not yet been stripped down. In this case, a Wychwood costing around £80 new. Much lighter, long cast coned spool, better clutch etc. There are a lot more parts and they are far more complicated.However, lots of plastic and nylon and the bearings are not stainless. I don't think it will be around in four or five years time if used regularly.