Have the customer give you a sample of the San Diego #s they are referring to... there is a style called San Diego, once popularized by the Chargers, but not used by the team for years - here's a link to Dalco's catalogue - you'll want to look at page 18 in the buyer's catalogue PDF... good luck
[media]http://www.dalcoathletic.com/catalog/2013/Catalog%202013.pdf[/media]