Regarding the transposing of marks (transferring of marks from one article to another), the Goldsmiths' Company Assay Office Website has a page on the Antique Plate Committee (APC) which is responsible for adjudicating spurious silver articles.
At the top of this webpage is a short video that provides background on the APC and at 1:50 into the clip it provides examples of spurious articles. The first example is a basket with transposed marks.
Goldsmith's Company - Antique Plate Committee - VideoWhen an item is sent into the APC for assessment, the committee will examine an article, and if it found to be spurious, it will cancel the marks and remark the item with "LAO" (London Assay Office) and the corresponding date, fineness, and location marks (see example below).
