Alexander Armstrong (rugby union)
| Birth name | Alexander R. Armstrong | ||||||||||||||||
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| Date of birth | 6 September 1897 | ||||||||||||||||
| Place of birth | Warren, New South Wales, Australia | ||||||||||||||||
| Date of death | 30 November 1973 (aged 76) | ||||||||||||||||
| Rugby union career | |||||||||||||||||
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Alexander R. Armstrong (6 September 1897 – 30 November 1973) was a rugby union player who represented Australia.
Armstrong, a number eight, claimed a total of 2 international rugby caps for Australia.