How Many Ounces is an Honest Pint?

Ron Gansberg, Raccoon Lodge brewer extraordinaire (or "Imagineer," as the Rac Lodge styles him), added a question in comments when he signed the Honest Beer Petition:
We here at Raccoon Lodge and Brew Pub want to comply with the honest pint movement. We need clarification. Is the glass 16 oz to the rim or is the glass 16 oz of beer + head to the rim? And if the latter, who is a good supplier?
Good question. There are three answers, reflecting the reality of the current situation. Since I'm spearheading this, I've worked up my own criteria, but I recognize that I'm not the final authority. But here's my take.
  1. Minimum standard - a sixteen-ounce glass at the rim. Effectively, you'll be getting in the 14-15 ounce range per pour. There are shaker pints that conform to this standard, and if all the Honest Pint accomplished was to provoke a switch to them, I'd be satisfied.
  2. Best standard - In England, pint glasses have a little head room, and an etched line that signals the full pint. Publicans employing 17- or 18-ounce glasses would be offering patrons a full pint of liquid. It's the less-weaselly solution.
  3. Alternative standard - many pubs actually use the English pint glass, delivering a full 20 ounces to consumers. This is an instantly recognizeable glass, with its characteristic bulge near the top (and to my mind one of the prettiest). Pubs using these generally note that they're 20-ounce pints or "imperial pints."
To add even more granularity to the conversation, I'll point out that the good folks at CAMRA (The Campaign for Real Ale in Britain) have their own effort to end "short pours," including an online petition. I foresee a time when Oregonians, satisfied that their glasses are honest pints, will push to end short pours (a scourge Doc Wort decries). But I'll take a simple switch to 16-ounce glasses.