Bulova 1951 -Unknown

This watch was purchased as a Watertight model.  I was unable to identify any date code on either the movement or the watch case back.  It does have a 51  between the Bulova logo and the case serial number inside the case back.  I presume this is the year of manufacture of the case and the watch since this matches up with the date range OF 1942 to 1954 for the 17 jewel 10BCC movement.  The case itself appears to be stainless steel.  The hands are luminous as are the numbers as well as the dots in the arrow markers on the dial.  I have no idea as to any redialing or replacement case.