This is a vintage Girl Guides trefoil enrolment/promise badge.
 
Key Features
Design Symbolism: The trefoil (three-leaf clover) shape represents the three parts of the Girl Guide Promise.
Letters & Symbols: The initials "G G" stand for Girl Guides, and the star cutout at the top leaf symbolises a guiding star. The stem forms a stylised cross or compass needle pointing forward.
 
Scroll Design: The blank scroll banner at the base indicates a classic design variant, often dating from the mid-20th century or earlier.
 
 
Registration Stamping
The Registered Design Number: The text "REG. No 671782" at the bottom is a United Kingdom Registered Design Number. This specific design pattern was officially registered and patented in 1919. 
 
An original vintage Girl Guides Trefoil Promise badge (traditionally known as a Tenderfoot badge), which dates from approximately the 1920s to the 1930s. 
 
Design Features: This is a brass or bronze stamped emblem featuring the classic three-leaved trefoil clover design. It features a fretted (cut-out) star on the top leaf and the letters "G" and "G" embossed on the side leaves. 
 
History: The central cut-out star represents the Guide Promise, and its multiple points traditionally represented the Guide Laws. Early variations from this period frequently display a completely plain lower ribbon scroll (lacking any text overlay).
 
Origin: The reverse side of this registered design (frequently marked with Regd No 671782) was manufactured primarily by British maker J.A. Wylie & Co in London or similar makers of the era.
 
 
 
 
Condition Notes
Your badge retains crisp letteringand its original long-hinged pin backing on the reverse. Having the intact historical "REGD 671782" stamp clear and readable keeps it at the higher end of its collectible value bracket. It has what appears to be the names of previous girl guides scratches into the rear. 
 
 
It measures 2cm x 2cm.