Belize, 1974 AD., Elizabeth II, Avifauna of Belize series commemorative non circulating issue, Franklin mint (USA), KM 42.

Belize (formerly British Honduras), Elizabeth II (until 1981), Avifauna of Belize series commemorative non circulating issue (1st edition, 1st version), Franklin mint (USA), 1974 AD.,
50 Cents (27,7 mm / 9,16 g), copper-nickel, 9,07 g. (?) theor. mint weight, mintage 8,806 , axes medal alignment ↑↑ (0°), reeded edge,
Obv.: BELIZE / SUB UMBRA FLOREO / 1974 , Belize crest, motto on ribbon below.
Rev.: FIFTY CENTS , 3 Frigate birds flying, value above.
KM 42 . (probably ex "Matte" quality)

From Franklin Mint souvenir sets, designed for the US "collector item" market, not for circulation. From 1975-1985 the Franklin Mint produced "coinage" for Belize in up to 3 different qualities:

Matte - Normal circulation strike or a dull finish produced by sandblasting special uncirculated (polish finish) or proof quality dies.
Special Uncirculated - Polished or proof-like in appearance without any frosted features.
Proof - The highest quality obtainable having mirrorlike fields and frosted features.

Year / Mint Mark / Mintage / Details
1974 FM 21,000 Proof
1974 FM 8,806 Matte