Globe Postcard Service (GPS) is a private postal service, providing postal delivery outside of Italy. There are 3 different zones division and it being reflected into the price.

ZONE 1 : €1.20 : European Countries
ZONE 2 : €2.00 : America and Asia Continents
ZONE 3 : €2.50 : Australia & Oceania

It must be noted that some seller may be overcharging than the standardised price.

GPS operated and being sold in the main italian travel regions. Through a strong partner network (stationery shops, hotels, book shops, camping grounds, hostels, tobacco shops) it offers an unique service for the tourist who wishes to buy and mail postcards.

Each individual stamp bears a unique code which can be used by sender to record a video message on GPS website using a special smartphone application and receiver may view the video by entering the code at

http://www.globepostalservice.com/videoinapostcard/

TOURIST STAMP
The company put a forward note that these stamps are not valid for postage within Italy.

Stamps' design for all three zones are similar except for three colour-code
Each strip only has 5 stamps with different design,
As I have never seen other stamps design from different region, I can only speculate that each region has its own design with local themes.

PRIVATE POSTAL SERVICE
Is an alternative to official or national postal service and licensed to sell, collect and make delivery of postcards and/or letters.