I was at a yard sale the other day and came across a K.T.O International Model 7070 in working condition.  Everything works with the exception of the FF button.  It has the power cord and doesn't appear that batteries have ever been installed.

Does anyone have any idea how old this is and how much it might be worth?

Same answer to any of these value questions...its worth whatever someone is willing to pay on the given day that you sell it.  So it could be big bucks or pennies depending on the day and who wants one...values go up and down big time

I can't find anything about the model so couldn't even give you a ballpark figure...post a picture and someone might give you an idea.