USA 1929 Round the World cover via LZ 127 Zeppelin Airship with $1 + $2 stamps

This lot has a 1928 Round the World cover from the USA. The flight was via the LZ 127 Zeppelin Airship. The cover has a Washington DC cancel and a Round the World cachet. Two of the stamps on the cover are a $1 and $2 stamp. The cover is in good condition. Please see the photo