A 1971 Deep Sea. The bezel appears to be that of a typical B model as I haven't seen my example model with the what appears to be a pepsi bezel. It is indeed a deep sea bezel and correct age. Perhaps a swap sometime or maybe was fitted with it originally? I have seen a B model with the typical plain bezel though. The movement shot shows the Valjoux 7733 markings as well. Recently serviced and working beautifully.
Oh, and to add one more wrinkle, my dial says 666 feet under Bulova. When apart, there was no marks on the back of the dial to indicate it had been refinished. This is puzzling.
BULOVA DEEP SEA CHRONOGRAPH " B "

The DIAL is from another deep see chronograph that uses a ..... TYPE " C " case .... see photo
The photo below would be the correct configuration for the dial on ur watch .........

This would be the correct configuration for the dial on ur watch .........