1. Each association shall keep complete records and books of account covering all business of the association. The director of the division of finance may adopt regulations concerning the making and retention of the books of account, minutes of proceedings of members of mutual associations, of stockholders of capital stock associations, and directors and all other records pertaining to the business of the association. Such regulations may include rules prescribing the accounting principles and practices to be observed, the dates upon which each association shall close its books, the description of assets and the amounts at which they are to be carried on the books.

2. The director of the division of finance may by regulation permit accounting, bookkeeping, data processing or other recordkeeping services to be performed for an association by contract or otherwise, whether on or off its premises, but shall require assurances satisfactory to the director that the performance of such services will be subject to regulation and examination by the director of the division of finance to the same extent as if such service were being performed by the association itself on its own premises.

3. In the absence of a regulation of the director of the division of finance establishing a different time, each association shall preserve all of its records of original or final entries for a period of ten years from the date of making the last entry thereon, but coupons accompanying deposits in a club account such as a Christmas club need not be retained for more than two years from the date of closing of such account.

4. In lieu of the original, film, photographic, photostatic or other copies which accurately reproduce all lines and markings on the originals may be retained. Any copy of a record permitted to be kept in lieu of the original shall be admissible in evidence in any proceeding with the same effect as though it were the original.