Bulova 1955 Ranger

I have here a very nice Bulova, L5 date code, but couldn't find it in the 1955 ads, I will be going through them again, this time more slowly.   No serial number on the movt, sorry, wasn't able to get a pic. The movt is stamped L5 also. 10k RGP bezel and SS back. 16mm lugs, and a very very slightly rectangular cushion case with a crystal that is less than 2mm different length by width. This watch belongs to a customer who I have asked permission to post these pics, it belonged to her father and is a very sentimental piece.  Any comments. thoughts or ideas as always appreciated and welcome. 

Rob