This center section is unbranded (that I can find- if you guys know what it is, please let me know). It has a Frankland cover on it and the casting marks 4200-A-287. It is steel. I am by no means a quick change expert, nor do I claim to be. Pictures titled "Rear Pieces" show the pile of innards that were also co-located with the housings. If you look at those and note piece(s) that you know specifically go with a particular center section, please feel free to reach out and let me know. This is one of 3 center sections being sold right now. Here are links to the other two: Halibrand: https://www.jalopyjournal.com/forum...ge-housing-w-modified-winters-covers.1255414/ Frankland: https://www.jalopyjournal.com/forum/threads/frankland-quick-change-rear-end-w-tubes.1255415/