I bought one new in I believe 1985,and my dealer said it was the first time that model came with BB slides,but only on the deep bottom drawer.Rest of the slides were friction.
If it's older than that,I believe they came with welded-in drawer dividers,which I liked.
Years later I traded it in on my SO box with BB slides,and unless the tool are super light,or the drawers really small,I couldn't go back to friction slide drawers now.
To me,the older boxes like that seemed better built,but the paint was thin and chipped real easy.I think they used laquer,is the reason why.
Steve