I get these from newspaper clippings, and generally only change it if the date is earlier than the "circa" one. I've been doing some very detailed Ceil Chapman research, and am entering the earliest dates that I find.
I've never seen a Spadea pattern with a date actually on the pattern. On the envelope, yes, but envelopes get swapped out and aren't reliable as to whether or not they match the date of the pattern, IMHO.
But whatever.......I just won't change anything. I understand that you want the wiki to be standardized and all, but all this does is keep people from wanting to add to the wiki. I am working very hard on cataloguing my very extensive collection as well as the patterns I'm finding in my research. Change whatever you need to change to make it how you want it. I'm just trying to fill in holes in the wiki with the hard facts that I have.
I am sorry you see this as a knock on what you are doing. Your work and additions are appreciated. I was merely trying to make sure that we (not I) are accurate in documenting things, and to not assume that the information you have gathered is absolute. The ca. reflects that.
If you have specific information on a pattern being included in a particular publication, do add that publication and date - it would go a long way to documenting the dating assumptions.
P.S.: Many 1960s and 1970s Spadea patterns do have the copyright printed on the pattern. Some of the 1960s ones appear to have been re-issued from 1950s patterns, sometimes even with different illustrations.
Somehow on Hollywood 1710, I knocked out the photo of the pattern cover. Can you recover it, and put my counter book photo in next to it? I don't remember being asked if I wanted to override the photo name, but I screwed up somehow.