This is modified Seiko 7548. It has a shroud mod to watch by John Bentley of TSTUK. Dial is from MCWW, hands from a Seiko Atlas, bezel from Dagaz. By far one
WYSIWYG: A Seiko 7548-700B | Adventures in Amateur Watch Fettling
WATER150mRESIST: A Seiko 7548-7000 from June 1982 | Adventures in Amateur Watch Fettling