Do please note - the older models were variable to say the least and in the case of the 770mk2 onwards, no two pairs were often quite the same as the designer tinkered too much! The classic cheap miniatures they did which sold so well were again, suitable for 80's vinyl but not more neutral sources, so be warned. I was given a pair of 737R's which had a really nice mid and ok bass (drinking straws in ports to minimise chuffing) but the little hard dome tweeter (a popular model back then) was as rough and ragged as anything and set too high, ruining the effect lower down...
761's and 781's were popular but rather toppy I remember. The slim 73* series rather better behaved and noce looking. There was a series around twenty years back that sounded awful (781 stand mounters?). They sorted it but wouldn't take the older shit ones back (we had to order them to keep the franchise). We kind of lost faith in them after this.
P.S. Mission was one of the first to order 'dealer contracts' specifying what we stocked and so on and to this day, not sure if it was fully legal or not. Long time ago now and I forget the sordid details. Linn did the same and promptly lost half their UK dealers, preferring the 'less physical sales but higher monetary value per box' approach I remember.