An expanding gentlemen's lawn tennis belt circa 1916, formed from a series of interlocking copper hoops and thread, measuring 32 inches at rest it exp

An expanding gentlemen's lawn tennis belt circa 1916, formed from a series of interlocking copper hoops and thread, measuring 32 inches at rest it expands to at least 42 inches when stretched, achieved simply by the tension held inside the copper loops, on the inside of the buckle is a flap which attaches to a loop at the other end of the belt, stamped into the flap are the words MARTIN patent No. 660336 MADE IN ENGLAND''