Stamp Giveaway # 37 (Artists) [solved]

Sao Tome and Principe, Rubens set; Congo (Brazzaville), Rubens single; Equatorial Guinea, Durer 2 gold foil gum deteriorated, 2 s/s; Titian (I guessed Rubens first because printing hard to read) block of 2; Fujeira, Durer silver foil single and s/s; Central African Republic, Picasso gold foil single and s/s

Only question: What country issued a stamp printed on aluminium foil in honor of the 40th anniversary of the aluminium industry in that country?

First response with correct answer at or before 10 A.M. Sept. 26, 2021 US eastern time wins. If there is no correct answer, first response wins. My decision of winner is final.

Good luck to all who choose to participate!

Will

North Korea?

Edit: it’s for the 40th Ann of entry into ICAO. However with the plane on the stamp, I figured that might be somehow related to aluminium

My guess is Hungary in 1955.
(https://colnect.com/en/stamps/stamp/220250-Csepel_Ironworks-International_Non-ferrous_Metal_Congress-Hungary)

Edit: forget this one. It was made for the 20th anniversary, not for the 40th, and for an international industry congress.
(https://www.buyhungarianstamps.com/products/3683)

Edit 2: The only aluminium stamps I'm finding on Google is this hungarian one and 3 soviets (one from 1961 and two from 1965), but all the 3 soviets are space-themed (4 if you count the overprinted variant of the 1961 stamp).

My first guess is Bahrain

Venezuela

Giobruno is correct. Somehow I thought it was 40th anniversary but 20th is correct. So congratulations Giobruno.

Will