If you need to know your Spacetop's serial number you can find it in a few places.

It is written both on Spacetop itself and on the boxes that it was shipped in. All Spacetop serial numbers start with "SPAWS" followed by a number.

To locate the serial number on your Spacetop, turn Spacetop around so it is facing away from you. The serial number is printed inside the pocket for the glasses storage, on the side of the indent.

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If you have trouble reading the serial number on Spacetop itself, both the external brown shipping box and black Spacetop box have the serial number written on them.