English Slazenger "Challenger No. 1" Wood Tennis Rackets EUC 1970's 1960's

Tennis Rackets made by Slazenger in England sometime in the 60's or 70's. These are definitely vintage items. I only have the one red cover but they both have the wooded cage cover. There is one little red broken string at the very top of one of the rackets. If you zoom in enough you can see it in the picture. It would be the 2nd picture.