This is an authentic Omega cream watch hang tag that came with an Omega Speedmaster Michael Schumacher Ledged 3506.61.00 watch. Your tag measures 3cm by 2cm and still has the original string. The writing on the back of your tag reads 35066100, 78119356, 3301.
35066100 is the model number, 78119356 is the serial number and 3301 is the movement number.
These tags are not available for sale individually from Omega and are only ever sold with a watch. This is a rare chance to complete your set so your watch has everything it was originally sold with.
I have given you photos of your watch tag from every angle. Please use them to add to this description.
If you have any questions then please contact me at Sales@TheWatchLink.co.uk. I'm here to help you.