I got this new in box delco master with a 75 coupe I just bought.Original part number is no longer with the box. The cyl has a 1" bore, with casting # that looks like 5460346. It is not a 1-1/8" bore, it is 1". The casting is hard to read but could be more like 5480848 or last digit 6? Do any 548 castings exist? I have found the 546 castings to be 1-1/8 bore for power brakes. This looks like a manual brake app. though. The letter tag on the wire bail is CN. The date code letters by fluid inlet are CN6238. My car has power brakes , so I guess this was bought and cast aside as useless to prior owner. Any ideas? Craig
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