||I've written Romberg's op. 11 on an old Atari computer more than 20 years ago. In 1994 there were only parts available but no score, so I wrote the score from these. Unfortunately there is a mistake with bar numbering in the first movement.
... And a mistake with the opus number too, or with composer attribution. Andreas Romberg's Op.11 is a string quartet. Probably Op. 22?... This has the same opening as Romberg's Op.22/SteR 19- (see, for example, I-Tf 4 VI 112. It is not the unpublished, manuscript symphony in D of 1792 (SteR 6), qv D-Hs ND VI 395 ee.) I suspect strongly that "Op. 11" is a typo. Unfortunate thing with typesets is that such errors should be fixed on the typeset (eventually), not just on the workpage, though...
Also, I think you'll find, if you look under Garland Publishing on Worldcat, that a score for this work was in fact available as early as 1985... see WorldCat. (And what I suspect is an even better one has been edited and published by Bertil v. Boer since, I believe.)