To be specific, it has 1 pistil with seemingly 1 stigma.
And excellent question.
Since we cannot easily see the dna, whether it has XX (female) or XY (male), a hermie could be a male high on ethylene, the female flower hormone, or be a female with extremely low ethylene production, too low to express as female (similar to spraying it with CS/STS entirely and early on).
When it produces only female seeds (which 11 out of 11 does seem to indicate, though theoretically it still possible to get 11 females out of 11 regular seeds) it indicates it's a female by sex chromosomes and has only X to share, and yours would be an example of full blown sex reversal (from female to male phenotype). Not extremely uncommon and probably often goes unnoticed.
I can't test it with potentially just 1 seed from itself but will use its pollen on its sister (whorled CHxCH female which ironically hasn't reversed yet while I treated it...). I hope they don't all turn out to be female, i.e. I hope it's a feminine male and not a masculine female.
Here's why...
Quotes below from: The draft genome and transcriptome of Cannabis sativa
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3359589/pdf/gb-2011-12-10-r102.pdf
"Cannabis has a diploid genome (2n = 20) with a karyotype composed of nine autosomes and a pair of sex chromosomes (X and Y). Female plants are homogametic (XX) and males heterogametic (XY) with sex determination controlled by an X-to-autosome balance system..."
X-to-autosome balance refers to a genotypic sex determination system in which the ratio between the numbers of X chromosomes and number of sets of autosomes is the primary determinant of sex.
In other words, 2 X is female, 1 X is male. The two X combined result in the hormone balance that makes it express as female. It's not something on the Y that makes it male, it's the absence of a second X.
Another quote:
"sex determination in Cannabis has been supposed to be based on a X:autosome dosage rather than on an active-Y mechanism (Westgaard, 1958; Grant et al., 1994"
This fits with the ability of XX plants being able to create staminate (male) flowers, as it doesn't need an Y (male sex chromosome) to do that. A female hermie (XX) could possibly have one or two inferior X's that even combined cannot produce enough of the female hormone ethylene to tip the balance entirely to the female side.
A male hermie (XY that produces pistillate/female flowers) could then have a strong/superior X that partly or entirely (if fully expressing as female) makes up for the absent second X.
If that's the case, the superior X of a male hermie could possibly be used to breed out intersex traits in females in a variety with weak Xs.
"The ability to undergo sexual reversion is thought to have a genetic base: some ecotypes such as the Italian Carmagnola are very resistant to any sex reversion treatment..."
Finding the male hermie with the strongest X could be simply a matter of testing which reverts to female with the least help, with the least amount of essentially adding ethylene production artificially.
Male sex reversal:
http://www.sciencedirect.com/science/article/pii/S0044328X72801685
Ethepon can also be used to boost trich production on males and females:
http://www.sciencedirect.com/science/article/pii/S0926669013000526