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  Louisville Slugger Bat Dating
Hillerich & Bradsby Co. has used different oval center brands in their history. Below are the ovals from different eras of bats. You can match these with the logo on your bat to get an approximate date for your Louisville Slugger bat.
PICTURE Years Produced - Description Sample

1897 - 1911
Top:
LOUISVILLE SLUGGER
                 -MADE BY-
CENTER: J.F. HILLERERICH & SON
BOTTOM: LOUISVILLE K.Y.
OUTSIDE OVAL BOTTOM
TRADE MARK
1897 - 1911  J.F. HILLERERICH & SON
1911 - 1916
Top: LOUISVILLE SLUGGER 
                ___  . ___

CENTER:  J.F. HILLERERICH & SON Co
                ___  . ___
BOTTOM: LOUISVILLE K.Y.
OUTSIDE OVAL BOTTOM
TRADE MARK REG US PAT OFF
1911 - 1916 LOUISVILLE SLUGGER
1916 - 1929
Top: LOUISVILLE SLUGGER 
                 125
CENTER:  HILLERERICH & BRADSBY Co
                        MADE IN USA
BOTTOM: LOUISVILLE K.Y.
OUTSIDE OVAL BOTTOM
TRADE MARK REG US PAT OFF
1930 - 1947
Top: LOUISVILLE SLUGGER 
                 125
CENTER:  HILLERERICH & BRADSBY Co
                        MADE IN USA
BOTTOM: LOUISVILLE K.Y.
OUTSIDE OVAL BOTTOM
TRADE MARK REG 
wpe1.jpg (8008 bytes)
1948 - 1963
Top: LOUISVILLE SLUGGER 
                 125
CENTER:  HILLERERICH & BRADSBY Co
                        MADE IN USA
BOTTOM: LOUISVILLE K.Y.
OUTSIDE OVAL BOTTOM
 REG US PAT OFF
1948 - 1963 LOUISVILLE SLUGGER 125  REG US PAT OFF
1964 - 1980
Top: LOUISVILLE SLUGGER
                 125
CENTER:  HILLERERICH & BRADSBY Co
                        MADE IN USA
BOTTOM: LOUISVILLE K.Y.
1973 Registered Trade Mark
first appears over the d in Powerized
1964 - 1980 LOUISVILLE SLUGGER 125
1980 -  2000s
Top: 125
CENTER:  LOUISVILLE
                  SLUGGER
BOTTOM: LOUISVILLE, KENTUKY MADE IN USA
wpe21.jpg (26035 bytes)
Some bats have an H&B brand in the oval trademark, rather than Louisville Slugger. The H&B brand denotes a lower grade and lower priced retail bat. These bats were produced from the 1920s through the 1970s.

NOTE:

Flame Tempered is a process of drying and hardening the wood with lower grade baseball bats. If your bat reads "Flame tempered it is a store model bat. "Powerized" is used on higher grade bats, and professional models.
Flame Tempered
"Bone Rubbed" is a process to harden the surface of the bat and appears on bats made in the 1920s Bone Rubbed

1931

The "Powerized" process was first used, and patented by the Hillerich & Bradsby Co. in 1931 and has pat. pending beneath the stamp.

1932

 "Powerized and Bone Rubbed" logo is used during the 1932 season.

1933 - 1934 

 In 1933 and 1934 you will see it stamped "Powerized and Oil Tempered" which usually is a very light heat foil type print. 
Powerized) in 1935 until present, they go with just "Powerized" The Powerized" process is to harden the surface of the bat much like the bone rubbed finish of the 1920's

HOW OLD IS YOUR ADIRONDACK BAT?
 
Here is an easy chart for dating your vintage Baseball Bats
ADIRONDACK  RAWLINGS BAT DATING



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