Nothing contained herein shall in any manner affect or apply to any existing contract to which the Mayor and City Council of Baltimore is a party or to any contract that the Mayor and City Council of Baltimore may enter into pursuant to invitations for bids issued by the municipality prior to October 1, 1945. City Code, 1950, art. 1, §18 1966, art. 1, §21 1976/83, art. 1, §24 Ord. 45-225