Filly
Colour: Chestnut, white blaze
Breed: Unknown
Type: Riding pony
Foaled: 1925
Height: 14.1 hands

MEDORA Young Stock Register (Numbers raised 1-112)
in the Supplement of 1931 to Volume 21 (1931/32/33)

FILLIES

MEDORA (Y.S.R. Page 22) chestnut, blaze and snip, both hind fetlocks white.
Foaled April 18th, 1925 Height 14.1 Measured April 23rd 1927
Owner and Breeder, Mrs J. Oscar Muntz ……
sire: Marzio (Vol.XXI., p.275) by Marcion
dam: Dora II (Approved Mare Register p.168), chestnut, 14 – 1 ½

Medora was six years old when she was registered in the Young Stock Register, a lot of the other foals were only a year old. From then on the numbers registered were considerably smaller.
So the Supplement for 1931 was a six year sweep to register Young Stock.
Medora was at Foxhams from 1925 to 1931 but I cannot guess whether she was trained for polo, but I do believe she was a Riding Pony perhaps for children.