That’s exactly the find I would love to stumble upon.There was one a month ago sitting with a for sale sign in bridgeport on twin lakes rd just after you turn off 395 in the eastern sierra,I did not get the info but ive seen the boat before in the marina at lower twin.Pretty sure it was someones trout sled with a nice warm cabin.
https://offerup.com/item/detail/8b5ac7d7-6d31-314e-984a-a0eb953b6da6?q=shamrock+boatOffer Up San Diego has one
Saw a smaller one on Seattle Craigslist not too long ago.
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2003 Shamrock Mackinaw 270 - boats - by owner - marine sale - craigslist
LOA 30ft. Beam 9'3" Draft 29" Weight 7525lbs. Power 315 HP Yanmar Diesel. Trolling valve. 900 Hours. Fire extinguisher system. Bow thruster. Shore Power system w/cord. Cabin heater. Hot water...seattle.craigslist.org