about four years ago I bought these bio.s at a yard sale for 10.00 dollars, as they are very light I thought they were for children and was going to give them to one of my grandsons( age 5). but after using them on the back pourch later that day, I decided they were just to good to be banging around on his three wheeler. i have taken them to africa three times on hunting trips and they did fine compared to other higher end bio.s. reading tru older American riflemen magazine( june 1954) I found add,s offering them for over 150.00 then. I found it pays to root thru junk boxes at yard sales and at flea markets as a jewel may be hiding in there.