Specimen presentation of debentures certificate for different kinds of debentures

Debentures are classified into various types. These are redeemable, irredeemable, perpetual, convertible, non-convertible, fully, partly, secured, mortgage, unsecured, naked, first mortgaged, second mortgaged, the bearer, fixed, floating rate, coupon rate, zero coupon, secured premium notes, callable, puttable, etc.