These shoes run true to size. I normally wear US 10.5D shoes, and the 10.5D 6654s quite well.

These 13D 6654s should fit someone who normally wears 13D shoes, and possibly someone who normally wears 12.5D shoes after replacing the given footbeds with a thicker alternative.

If these shoes would be used for work in a company that helps cover the cost of footwear, let me know before buying so I'll ensure you'll receive a proper invoice that can be shown to your employer.