The members and certain conditions of membership in the retirement system created by this act shall be as follows:
Such persons shall not be given credit for pension purposes hereunder for any prior service; provided, however, that where any such employee has had service prior to March 26, 1961 as an employee in any State, county or municipal position, such employee shall be given credit for pension purposes hereunder for such service upon written application therefor to the pension commission within 1 year after becoming a member of this retirement system and upon payment into the retirement system herein provided. Such member shall receive credit for all of his service in the employ of the county or for any part of his service in any other compensated, public position in the State of New Jersey, elected or appointed, provided that payments are made by such member in an amount or amounts calculated in accordance with the rules of the commission as may be necessary to provide 1/2 of the actuarial cost of such service credit. In the event that such member retires before he completes the payment for the service credit that he is purchasing, credit for such service shall be given in direct proportion as the amount paid bears to the total amount of the obligation. Said sum of money may be paid in one lump sum or by semimonthly deductions from salary, together with the regular deductions provided by this act, until completed. All payments aforesaid by the employee shall be made together with interest thereon at a rate to be determined by the pension commission.
County employees in counties of the first class (article 1 of chapter 10 of Title 43 of the Revised Statutes);
County detectives in counties of the first, second, third, and fifth classes (article 2 of chapter 10 of Title 43, of the Revised Statutes);
Probation officers of counties of over 83,000 inhabitants (article 5 of chapter 10 of Title 43, of the Revised Statutes);
Sheriff's employees in counties of the first and second classes (article 6 of chapter 10 of Title 43, of the Revised Statutes);
Sergeants-at-arms and court criers in counties of the first class (article 7 of chapter 10 of Title 43, of the Revised Statutes);
County superintendents of weights and measures and assistant county superintendents of weights and measures ( "An act providing for the retirement of persons employed in the department of weights and measures of any county in this State, and providing a pension for such persons so retired," filed June 21, 1938 (P.L. 1938, c. 397));
County park police in counties of more than 200,000 population (sections 40:37-157 to 40:37-174, inclusive, of the Revised Statutes); shall on July 1, 1943, automatically become members of the county employees' retirement system provided for by this act and all such employees shall be deemed to agree and consent to the transfer of such membership unless they, or any one of them shall, before July 1, 1943, by written notice to the pension commission of their respective retirement systems operating in such county, elect to withdraw therefrom their contributions theretofore made, without interest. Any such members electing to withdraw from such membership shall thereafter be ineligible for membership in any retirement system of such county, or for any pension payable, in whole or in part, by funds of such county under the provisions of any statute of this State except sections 43:4-1 to 43:4-5, inclusive, of the Revised Statutes.
All such employees who become members of the county employees' retirement system provided by this act shall be given credit for pension purposes hereunder for all services, including services performed in any elective office, rendered to the county prior to July 1, 1943; provided, however, that where any such employee had theretofore agreed, under the provisions of article 1 of chapter 10 of Title 43, of the Revised Statutes, to pay for any part or all of such service rendered to the county prior to July 1, 1943, the transfer of such employee's membership into this system shall include the transfer to this system of all the conditions and obligations of such prior agreement made by such employee and such employee shall be deemed to agree and consent to the transfer to this system of such conditions and obligations until the conditions of such agreement have been fully complied with.
Except as otherwise provided by section 8 of this act, where any such employee's membership shall be transferred to this retirement system on July 1, 1943, such employee shall be given credit for pension purposes hereunder for any prior service or services rendered as an employee of the State and of any municipalities or other political subdivisions of the State, upon application therefor to the pension commission within 1 year after the transfer of such membership, and upon payment into the retirement system herein provided, for a period of time equal to the length of prior service for which credit is allowed, of a sum of money equal in amount to 3% of salary, said 3% of salary being based upon the salary received by such employee at the time of the making of said application. Said sum of money may be paid in one lump sum or by semimonthly deductions from salary, together with the regular deductions provided by this act, until completed; provided, however, that such prior service shall be credited only as paid for. Upon such payment or payments being made, the county shall annually pay into the retirement system herein provided a sum of money equal in amount to the employee's principal payment or payments. All payments aforesaid by the employee shall be made together with interest thereon at a rate to be determined by the pension commission.
N.J.S. § 43:10-18.6