If the knob has a number ("35" or "5") or a combination such as "RC 4" stamped into it, the bat is from the store.
H&B stamped pro model numbers into the knob until 1976; after that, nothing would be stamped into the knob.
Once you have an idea whether your bat is a pro model or a store model, the next step is to identify the era the bat was used.
If your bat reads "Flame tempered it is a store model bat.
"Powerized" is used on higher grade bats, and professional models. has used different oval center brands in their history.
The H& B brand denotes a lower grade and lower priced retail bat.
A collection of four Louisville Slugger baseball bats by Hillerich & Bradsby Co.
On this page I will briefly outline some common information regarding labeling periods.