Permanent validity - Priority letter 20g to France - Issued from the mini sheet (Yt:FR F3778A) of 10 same stamps each with a valueless thumbnail "Philatelic Service of the Post" 或者 "Personalized stamps" - Note that the thumbnail can be customized in a personal way - The gum can be matte or shiny - Exists without phosphor strip.
Exists according to the Yvert catalog:
- offset, self-adhesive, die Cut 11 (A52C / 3778B)
