C. Itoh is a huge company and Bridgestone was a part of C. Itoh. Most of the C. Itoh branded bikes I've seen are low to middle tier. The one pictured appears to be lower end and is likely a "department store" offering. Not meaning to offend. It might make a decent rider but personally, I wouldn't invest too much in it. A few of the bikes in your signature blow this one away.

So it is not a Bridgestone, is probably mid '70s and valued around $75.00 or so.