The right-arm offspinner's scalps that May included David Boon (61 runs) and Tom Moody (17) in the first innings, as well as Geoff Marsh (57) and Carl Rackemann (duck) in the second dig of the drawn affair.
It was a rarity for anyone, including his premier club teammates in Hastings, to hear Unwin talk about his county feat at a club that boasted pedigree players such as Mark Gower, Viv Richards, Ian Botham, Martin Crowe and Joel Garner.
Cornwall club stalwart David Black did recall Unwin quietly recounting his five-wicket haul to the Central Districts Under-17 team in New Plymouth in 1991 to inspire the teenagers who had lost a game.
"It was raining the day of their second game and Unners was telling them the story in a very humble way," says Black, who also revealed Mark Greatbatch, Mark Douglas and Peter McGlashan jnr were other Cornwall exchange players to the English club.
Not wanting to dwell much on his Somerset achievement this week, Unwin was excited at the prospect of the Black Caps playing Australia in the ICC World Cup final before the second semifinal in Sydney on Thursday.
"I'd love to see them play the Aussies in front of 100,000 spectators," he says, mindful it'll be difficult for the Kiwis to beat their neighbours twice but relishing the thought of Aussie fans squirming on their home turf at the MCG tomorrow from 4.30pm.
"Marty Crowe is a talent so it'll be an outstanding send-off for him," says Unwin of Crowe who is battling terminal cancer.
"Marty always had that tall poppy thing so it was tough and he never got the credit he deserved," he says of Crowe who he played alongside in the CD Stags in domestic cricket.
"It's sad to see someone of his ilk like that now but the way he's dealing with it [cancer] is a true reflection of who he is."
Crowe, New Zealand's greatest batsman, found himself caught up in Somerset upheaval in 1986 when the county club recruited him.
The then newly-appointed skipper, the late Peter Roebuck, was coming off a disastrous season for Somerset who finished bottom of the table.
Roebuck felt the "immortals" in the team weren't pulling their weight and was determined to rectify matters.
Richards and Garner were sacked in favour of Crowe, prompting Botham to resign out of loyalty to his West Indian mates.
Sir Ian Botham was part of the TV commentary in this ICC World Cup, calling the games in New Zealand and Australia.
Crowe, who is a columnist for Cricinfo, possessed wristy gracefulness in batting often associated with batsmen from the subcontinent and remains the only cricketer from this part of the world to have such fluency.
Arguably Australian Dean Jones was the only one to come close to Crowe's elegance, not taking into account the age-old game of statistics and averages.
