This is the massive Aquastar Benthos 500 with the very rare decompression bezel.
The movement is an A. Schild cal. AS1902 enhanced by a fly-back minutes counter. The orange minutes hand is started and reset by the pusher at 4 and stops after one revolution.
3590.50 with panda dial, Alaska second hand and black hands. Unlike my other LEs it's not a genuine LE, but I like it a lot anyway. I wear it more than the genuine ones...