Here's what is says about your stamp though: Num. printed: 47085000, in use until 30 June 1923. There were quality problems with the whole issue (paper creasing, partial loss of gum, and perforation problems). The artist of the design is S. Badzhov.
Thanks guys. You guys are great. Am sorting out my dad's collections which has been neglected for the last 15 years or so. Am getting caught in between when I come across stamps not in English. There are few more stamps not in English and some real funny stamps. Will post them as I sort them out. Am glad to have found this forum. Tks once again guys.