72 Pa. Stat. § 1804
Article V of this act shall take effect on the first day of June, one thousand nine hundred and twenty-nine, but in all other respects this act shall become effective on the first day of July of said year, except that any licenses and tags or buttons issued prior to the effective date of this act shall remain in full force and effect for the period for which they shall have been issued, and any forms of license and tags or buttons prepared for issuance or for the preparation of which contracts shall have been executed prior to such effective date, may be used by the Department of Revenue during the remainder of the year one thousand nine hundred and twenty-nine, notwithstanding they bear the name of a department, board or commission other than the Department of Revenue.
72 P.S. § 1804