So, what's this then? A MacCann Duett with the patent nr 4752 (MacCann?) stamped onto the wooden handle bar. But as to age and other history i am lost. It was bought in an auction in Sweden recently and probably belonged to the "Salvation Army immigration" wave to Sweden around the turn of the century 1900, not later than 1910.
Any better bids?
Ahh yes it also has a number stamped into the left side outer rim of the bellows, 181 0 71.