Vintage Aluminum Cowboy Spurs (Women or Youth size)

Women's or youth aluminum spurs. The letter R is engraved on both spurs it would appear from the factory.
Measurements -
2 inch shank
1/2 inch band
5 inch length, including rowel 51/2 inch
1 3/4 inch rowels, 9 points
31/8 diameter inside strap buttons