Max? Ugh !(great repertoire but best sung by others, I have a great MB piano roll- all the words without his voice, for me to murder, pedalling is good for the thigh muscles too!). My first guess was Robin Hall & Jimmie McGregor but my mind's ear has a soft, slightly Irish, voice like Val Doonican's, not a brash breezy one like Max B.? 1960s would be my guess, rather than '70s. Steve Parkes, Britain's answer to Joe Offer, will probably pin it down- it isn't in my collection.