1851 AD., Great Britain, International Exhibition, Brass Medal, BHM 2469.

Great Britain, International Exhibition, 1851 AD.,
Brass Medal (27-28 mm / 7,71 g),
Obv.: VICTORIA - REGINA , head of queen Victoria left.
Rev.: THE CRYSTAL PALACE / LONDON 1851 // PROPOSED BY / H. R. H. PRINCE ALBERT / COST L. 150.000. , the huge building known as the Crystal Palace (expo building) and surroundings.
BHM#2469 Br. RR. AE. RR. .

thanks to "constanius" for the reference

For other medals of the 1851 expo: http://www.btinternet.com/~malcbenn/expo1851.htm .