Ah, but, there is one big difference ... although not sure if it is significant or not?
Our mystery tug has that thin pipe (steam whistle, or similar, asks this ignorant landlubber?) in front of the funnel - the GYPSY KING does not .... although might it have been removed at some stage?
Whereas the TEAZER has that pipe and the same number of flutes .... but I'm not saying that is QED!
See:
http://www.tynetugs.co.uk/teazer1866.htmlAlso owned by Robson 1898-1912 ... and obviously engaged in fishing for some of her life.
Ron