Sec. 6.19. CERTIFICATE OF MEMBER PENSION BENEFIT ELIGIBILITY. When a member has earned five years of pension service, the member shall be issued an incontestable five-year certificate indicating that the member is entitled to pension benefits subject to the effect of any withdrawals as permitted under Article 6243a or this article. The certificate shall state that the calculation of the retirement pension to which the member is entitled, or any disability benefits to which the member may become entitled, shall be determined solely under the actual terms of the combined pension plan as in effect at the time the member leaves active service. The certificate shall further state that in the case of the member's death, the member's qualified survivors, if any, may become entitled to death benefits as determined solely under the actual terms of the combined pension plan as in effect at the time of the member's death. The certificate shall bear a seal and be signed by the executive director and chairman of the board.