Greetings Loren,
It seems that the most knowledgeable Ericson folks (people like yourself) pop up in the most valuable Ericson information locations...I have noticed your posts on the Sailnet Ericson list quite a few times. I'm a relative newcomer to posting here, although I did "register" our boat awhile back.
From two sketchy sources, one of which isn't all that sketchy as it's the brochure for the wheel-steering model of an Ericson/30 appearing on this site, I believe that the original E/30 was quite a bit narrower in the beam (9' x") vs. the E/30 II and the E/30+. The brochure on this site for the E/30 (and, I'm assuming this is for the E/30 II, which, according to someone else's post on this site in a different thread, began production with a 1977 model) has a beam of 10' 5". According to the brochure available on this site, the E/30+ has a beam of 10'6". This makes me wonder whether they are REALLY different--it seems very unlikely to me that a yacht manufacturer would create a new mold for one extra inch of beam. I'm keeping my fingers crossed on info that can establish the E/30+ hull design predates 1975.
Below is a selective excerpt from that post by Rico as a reply on the E-34t history thread...I am hoping that if you read this, you take the time to look over this excerpt and let me know whether these dates coincide with any information that you might have so that I can establish some degree of confidence in them. Rico doesn't say where he came up with these figures...plus, if it's not cut & paste, there's always the chance of typos.
Regards,
Ed
Model Number Hull and Year
E/30 - I #1 (1966) thru #150
(1970)
E/30 - II #1 (1977) thru
#47 (1979)
E/31 - I (c) #1 (1976) thru
#27 (1978)
E/31 - II (Ind. 31) #28 (1978) thru
#71 (1981)
E/28 - II #600 (1985) thru # ?
E/30 - III #501 (1979) thru # ?
E/32 - III #601 (1985) thru # ?