Classicrugbyshirts.com have a Dolphin Jersey listed, details below.
They say early 90’s, but it was a bit later than that. TNT were the Clubs Main sponsors for five seasons from 1995/96 season. Looking at the logo it is most likely to be 1998-99 or 1999-2000.
1990’s Dolphin RFC Cork No 2 Match Worn Rugby Union Shirt 2XL
This is a Dolphin RFC Official Badger Match Worn
Rugby Union Shirt from the 1990s
CONDITION – Shirt is in well worn condition
CONDITION DETAILS – Colours are good on main body, there is wear and discolour to the collar. The sleeves have been cut down
SIZE – Label has faded from measurements Adults 2XL
Armpit to armpit 26 inches. Top of shoulder to bottom of shirt 30 inches
FEATURES – Velvet number 2 stitched on patch on back. Reinforced shoulders
DETAIL – Rare shirt believed to be match worn from the early 1990’s. Dolphin are based in Cork, Ireland