A nice October 31, 1919 "Take your Vacation in the National Forests" slogan cancel from San Francisco, California on this cover that was sent by an Insurance Broker to Guaymas, Sonora, Mexico where it was backstamped.  Interesting and attractive historic item.  Fine condition; sharper than the image may appear.  If the image does not readily appear, please try hitting your computer's reload or refresh button while viewing the item. Successful bidder to pay $1.50 shipping in the US ($2.50 elsewhere); insurance extra if desired. PayPal accepted for payment. Questions -- please ask~