I also think that we should use flag of Tallin but the older one:
The image of the flag of Tallinn was fixed for the first time in a Heraldics Atlas, published in the middle of the XVIII century in Nuremburg. In the middle-ages it was the flag of the commercial fleet of the Hansatown. Ratio: 1:2 (also used at 1:3).
Toomas Mölder, 12 June 1995
At J.W Norie - J.S. Hobbs: Flaggen aller seefahrenden Nationen, 1971[ nor71] (original print 1848):
98 Revel - Six stripes blue over white.
[beL56] has six stripes white over blue for "Pavillon de Revel. en Livonie".
Peter Hans van den Muijzenberg, 12 and 27 November 2001
The flag of Tallin emerged from the oldest coat of arms of medieval Danish clan Hvide. Besides visual sameness (for example
http://www.familiekroeniken.dk/site/person.asp?person=68730 ), there is also strong historical connection - one of the Danish leaders of Estonian crusade and first administrator of newly conquered Danish Estonia was archbishop Anders Sunsen from clan of Hvide.
https://www.crwflags.com/fotw/flags/ee-talin.html
Former numista referee for Poland and half of african countries.
I invite you to my FB group about commemorative coins :
https://www.facebook.com/groups/1635288620035921