I am not the authority, but I've seen many many rosies and produced my share in the past. I have yet to find a mature male that was without spurs. Of course, if a rosy didn't have spurs, I automatically called it a female, so perhaps my comment above does not help. Some females can have very small spurs, though I do not think it is common.

I guess there is one way to find out - put it in with a female next year. I would not pop mature rosies BTW.