Give the mix one clear rule
Choose a common diameter, colour family or style of decoration, then allow other details to vary. Keeping every characteristic different makes it harder to build a balanced setting. Start with one complete place setting and photograph it on the intended table before searching for more pieces.
Compare profiles as well as patterns
Two plates with the same diameter may have different depths or rim widths. Stack and photograph comparable examples if you can inspect them in person. For remote buying, request measurements and individual condition descriptions. A rim that looks small in a picture can change the visual space available for serving.
Separate display from table service
Check suitability for the intended food-contact and cleaning conditions rather than assuming old tableware is ready for regular use. Pieces whose suitability remains uncertain can be reserved for decorative display. For professional projects, keep the approved reference, quantities and replacement criteria together so the buyer and service team work from the same specification.
For the next part of your selection, read Silver plate marks and condition: a buying guide.
For a related collection, explore antique serving dishes and tableware at French Country.