#mako
Google Nexus 4 prototype
Source

• Android 4.1.2
• Not for sale engraving on rear
• HW Rev 1.0

Follow @GoogleInternal

#angler
Google Nexus 6P prototype
Source

• Engraving on display
• Q instead of Google logo (there was also a proto with O on the back and no 6 circles)
• 6 dots on back

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#mako
LG Nexus 4 prototype
Source

• Rectangle housing to hide phone's design
• LG stickers
• Internal build of Android 4.1.2

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#shamu
Nexus 6 prototype

• Motorola confidential engraving on display
• Rear fingerprint sensor, not present on retail

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#hammerhead
LG Nexus 5 REV1
Source

• Android 4.4.2
• Not for sale engraving
• Rectangle housing to hide phone's design
• LG stickers in Korean
• Removable back (not on final)

The device is on sale on eBay if you're interested in buying it

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#atlas
Google Pixelbook Go prototypes

• ProductName instead of PixelBook on keyboard
• Prototype logo on lid

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#sargo
Google Pixel 3a prototype

• prototype logo instead of Google

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#coral
Google Pixel 4XL prototype

• Internal symbol as logo

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