53 Pa. Stat. § 23658
Beneficiaries under the fund, who retire or who become eligible to receive a pension allowance on or after November 9, 1965 and before the effective date of this amending act, shall be entitled to receive from the fund, per month, an amount equalling fifty per centum of the average monthly salary earned by the contributor as an employe of the Bureau of Police of the city during any five calendar years of service or the last sixty months immediately preceding retirement. Beneficiaries under the fund, who retire or who become eligible to receive a pension allowance on or after the effective date of this amending act, shall be entitled to receive from the fund, per month, an amount equalling fifty per centum of the average monthly salary earned by the contributor as an employe of the Bureau of Police of the city during any three calendar years of service or the last thirty-six months immediately preceding retirement. If any employe has not been employed in the Bureau of Police at least five years, but is otherwise entitled to a pension, such employe's pension shall equal not less than fifty per centum of the amount which would constitute the average monthly salary or wages received by the beneficiary as an employe of the Bureau of Police. Pension payments shall always be payable on the third working day of each month and shall be for the preceding month.
53 P.S. § 23658