Bulova 1970 Surf King

Here is one that tricked me.  I originally thought this was a Commander but upon turning it over it had a N0 date code and was a mono case.  I was sure the Commander did not go into the 70s.   Luckily I found it in the Line Books and it is a 1970 Bulova Sea King "BC" a first for the database.    The movement is a 10COAC and has 30 Jewels and a split stem.  The dial is silver with cocentric rings like a record and has an applied polished silver outer ring with applied beveled hour markers on top of it with lumed dots.  The hands are lumed also.  .  It has real depth.  The case is stainless steel and marked W. Germany.  It came on an original bulova bracelet.