This is not an April Fools joke! This is from our 63 coupe that the factory used as a "test model" from 3/63 to 12/64 when the car was sold. The car has many but not all C features.
For those without a photographic memory of C calipers, I should have stated that the brake hose is not nearly in the usual position on this caliper. The car uses drum hoses and who knows where that adapter came from.