help needed to value old banknote

[jjnco]

Hi

wonder if anyone can help me with valuing my old banknote Ive had in my collection for over 30 years

1948 Republica Portuguesa 2 1/2 Dois Angolares E Meio banknote

number B 016528

Decreto number 37.086

printed on the bottom is

Thomas De La Rue & Coy ltd londres inglaterra.

note is in very good condition

can anyone point me in the right direction of its possible value?

thanks