Welcome. Laura engines are made in Holland (now The Netherlands).
M48 The Laura M48 is used on 1976-80 Batavus and ROG mopeds in the US. In Europe and Canada the M48 is also on Solo, and early 1971-73 Tomos, and others.
M54 In Europe and Canada, the 1973-77 Laura M54 is on Solex Tenor and others. The Laura M54 is basically an M56 top end (piston, cylinder, and head) on an M48 bottom end.
M56 The Laura M56 is used on 1978-80 Batavus mopeds in the US, and others in Europe. After 1980 it was re-made in Korea by Daelim Motor Corp. for the brand known as Trac (made by Kia) in the US. The M56 remake was on 1982-86 Trac Clipper, Eagle, and Hawk models. The M56 remake engine is 99% the same.