As you noted they were built by the Alsberg Brothers in California from approximately 1984 through 1989 with mots being built in 1985. They were designed by Carl Shumacher
Thier dimensions are LOA: 37'' LWL: 31''-2" Displacement(as listed in their literature): MK1 8,500lb- MK2 9,500 lb- ''C''10,200lb draft: Variously listed between 7''0" and 7''6". There were several Engines used but most had Yanmar 12hp 2GMF. Tankage was Fuel: 19 gal, Water: 30 gal (more in the ''C'') model and Holding: 20 gal.
There were two rigs (a tall and a short) and three keels (one was a custom bulb design by Schumaker than drew only 6''10").
They were good race boats in areas where there are good breezes. There are still active one design fleets on Long Island Sound and in San Francisco. At one time there were a lot of them on the Chesapeake since one of the partners in Alsberg lived here in Annapolis.
I would like to find the other Mk2s.From what I can find out the Mk2 were the last build. They was 8 in all for long island sound and sold by Northeast Yachts. They had the taller mast and a longer boom. With elelpcal rudder and keel (6.6) and a weight of 10500.The reason for the increased weight was the added interior and other things like a wheel and deck lockers.