A piece from Dutch magazine Bromfiets (Auto-Cycle) from May/June 2004 giving a buyers guide to the Jawetta model 551. 

They, incorrectly, refer to this as a Babetta - the Babetta name was not used until much later and only from model 28 onwards.
The categories translate as:-
A is a perfect original or very good, correctly restored bike. B is complete and possibly running but in need of work.  C is a complete tatty bike or a basket case that is restorable.
Under the model is a remark about the quality of these being better than the later mopeds (which i would agree with) and says that parts are available from Germany & the Czech Republic (and Slovakia).