The Alexander racquet company is a great story. Book available on this company so if you would like to get a copy I can put you in touch with the author.
The Slazenger is quite heavily worked with scalloped shaft and throat treatments. This pic gives you a bit more of a close up look. Rare to see on any racquet.
Rod from www.tennishistory.com.au Australian & Unusual Racquets, Old Video, Trophies & Books. Also see Australian Tennis History on FACEBOOK