Any grade lower will devalue the price considerably.Hillerich & Bradsby Co., Louisville Slugger, used different center brands over the years on their line of baseball bats., The different logos, and trademarks can be used to date the era your bat was made.1906 P. Goldsmith bought out Mac Gregor in 1944 and became known as "Mac Gregor Goldsmith" Finally, in 1952 the Goldsmith name was dropped entirely and the company was simply called Mac Gregor.You may also use the Google search box provided at the top of each page to assist you in your query. Louisville Slugger has used different oval center brands in their history.By identifying the center label, trade marks, and patens you can narrow down the year to what era the bat was made. They introduced the "Powerized and Bone Rubbed" logo for the 1932 season and in 19 you will see it stamped "Powerized and Oil Tempered" which usually is a very light heat foil type print.
Some years ago there was a craze for these coins and the price was much higher.
Early bats with Wagner or Cobb engravings are popular items among collectors today.
Frank Bradsby, a salesman, signed on to partner with Hillerich in 1911, although the bats were not branded as Hillerich & Bradsby until 1916.
This antique baseball bat was made by Zimmerman and features the attractive crossed bats and baseball logo.
Within that logo is indicated "Oil Tempered" and on the barrel end is the model name, Professional.