The bonds issued pursuant to this chapter shall be and are hereby declared to be legal and authorized investments for banks, savings institutions, trust companies, building and loan associations, insurance companies, fiduciaries, trustees, and guardians and for all public funds of the Commonwealth or other political corporations or subdivisions of the Commonwealth. Such bonds shall be eligible to secure the deposit of any and all public funds of the Commonwealth and any and all public funds of localities, school districts or other political corporations or subdivisions of the Commonwealth, and such bonds shall be lawful and sufficient security for such deposits to the extent of their value when accompanied by all unmatured coupons appertaining thereto.