Ambassador was produced and sold in the USA until the late 1970's by Hiram Walker and to disagree with Martin Green they only sold it in 4, 8, 12, and 25yo ages together with an 8yo liqueur version for the New York area.

The brand was reintroduced in the mid 1990's under licence and only for the East Coast so these may have included a 10yo version. These bottles had a different label so photo's would help to verify which age they were.

As a rule the Bloch Brothers are the oldest followed by Taylor Ferguson but the reintroduction also has this name on the label so label design is the best bet at aging them