a x42? knobby? i of course immediatly thought of a an older Bianchi Volpe or Randonneurer but the Rando has vert drops and I am not sure if a Volpe can take a x42 tire. then again both are not easy to come by.
aside from the tire size most any older touring bike would fit the bill, but you need to experiment on tire size. it would be pricy and the BB likely a bit high but an older steel cross bike may work
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk