Brand: Mark Levinson
Unfortunately, without further context, it's unclear what "Mark Levinson no 26" refers to. Please provide more information so that I can better assist you. Is this a model number for a specific Mark Levinson audio product? If so, which product? Is this a serial number for a specific item? A code for a specific function or setting on a device? Please provide additional information so that I can better understand your request and provide a helpful response.