The Holland 25 is a 25 foot extended version of Ron Holland's 24' Eygthene and Tiki IOR quarter ton yachts. It was exclusively built in Australia in the late 70s to 80s with aparently over 150 built in both masthead and fractional rigs. Many still race and cruise in Australia but there is no association.
We have set up an online Forum to hopefully collect owner's hints, old and new photos, and somehow obtain accurate hull design drawings along with sailplans for this IOR Quarter Tonner yacht. It may also create a location for other quarter ton yachts to meet.
Location of forum is
http://holland25.proboards.com/index.cgi . Hope to meet some Holland 25 owners on there sometime.