https://www.vinceremos.co.uk/product/organic-golden-rum-papagayo/
https://www.caribjournal.com/2016/12/09/first-organic-rum/#
https://www.klwines.com/Products/i?i=1054912
https://deepislandrum.com/

Pusser's rum

Woods Navy Rum

Royal Navy Rum

The rum ration, or "tot", from 1850 to 1970 consisted of one-eighth of an imperial pint (71 ml) of rum at 95.5 proof (54.6% ABV), given out to every lower deck sailor from the age of 20 onwards at midday. Senior ratings (petty officers and above) received their rum neat, whilst for junior ratings it was diluted with two parts of water to make three-eighths of an imperial pint (213 ml) called grog.

The rum ration was served from one particular barrel, also known as the "Rum Tub", which was ornately decorated and was made of oak and reinforced with brass bands with brass letters saying "The Queen, God Bless Her".

Tot glasses were kept separate from any other glasses. They were washed on the outside, but never inside, in the belief that residue of past tots would stick to the side of the glass and make the tot even stronger.

For Comparison
1 RN tot is 54.6 x 71ml = 38.766 ml (39)
3 x 25ml Woods @ 57% = 42.75ml (43)
3 x 25mlPussers @ 54% = 40.5ml (41)
4 x 25ml of 37.5 = 37.5 ml (38) (Papagyo FairTrade)
4 x 25ml of 40 = 40 ml

Royal Navy Grog 231ml @ 18.2% equivalent to 4 x 50ml glasses of port
4 x 50ml of Port @ 20% = 40ml