No, HWID (Hardware Identification Number) value is displayed in the Inventory page and in GarminDevices.xml.

Open the GarminDevice.xml file in your Nuvi Garmin folder using any Internet browser.
Find these text - usually at the start of the listing.

<Model>
<PartNumber>006-B0932-00</PartNumber>
<SoftwareVersion>260</SoftwareVersion>
<Description>nüvi 205W</Description>
</Model>

The B0932 number listed at the PartNumber is the HWID, in this case it is 0932 for the Taiwan Nuvi 205W.