The insured may request the purchase of an assumed service period to be included in the actual service period under the following conditions:

The insured must express in writing his desire to purchase such period prior to the termination of his service.

The insured must have spent twenty years in service at least.

The period to be purchased must not exceed five years for the male insured, and ten years for the female insured.

In all cases, the insured shall bear his share as well as the share of the employer for the period to be purchased, and such in accordance with the salary of subscription calculation at the date of the request of purchase, provided that the payment is made all at once or in installments, and that the period of installments does not exceed the reach by the insured of the age of sixty. In all cases, the expenses of purchase must be paid in full prior to the end of the service.

In the event of the death of the insured, the collection of installments shall carry on from the pensions of the beneficiaries thereof.