$300 does sound high for a Speed Six. Of course, the value of anything is what people are willing to pay for it.
Anyway, IMHO the Speed Six is a good gun. I used to have a blue one. It was .38 Special, but the owner's manual pointed out that it could take +P and even +P+, which impressed me very favorably at the time. Unfortunately, I traded this gun away--one of a number of trades over the years that I wish I hadn't made.
[This message has been edited by jimmy (edited November 23, 1999).]