Navy OBL-2 'scope. How old???

[radiotvnut]

I hope someone here can shed some light on this old Navy oscilloscope. It is a model OBL-2 and was made by Reiner Electronics Company for the Navy Department, Bureau of Ships. The screen is about 3" and it uses all octal base tubes. It is full of Sprague caps that are grey in color. I fired it up with the variac and I get some life; but, it needs a good cleaning and a re-cap. I think this would be an interesting piece to add to my antique radio test equipment collection. Anyone have any idea how old this thing is?