Serial Number ?? Where is it ?

[paintflick22]

I have a 68 Classic Mag. Im tryin to find the serial number to send in for the x-valve. Can you help me find the right number ??

[pputkowski]

It should be in the area that i boxed in blue.
hoped JadedT doesnt mind me using his pic.
http://www.fallingaway.com/ao_upload/RTP03.jpg