There should be an engine id tag on the engine stating the cc.
Manufactured from late 1970 to late 1972 (model year 1971 to 1973) this would be a 1600 cc engine.
1971 or 1972
This would be the model year 1971 through early 1972 Type 1 Beetles with the "34 horsepower" 1200 cc engine.
This would be model years 1971 through 1972 1200 cc "34 horsepower" Type 1 Beetle engines.
According to Chilton's 1971 455 is 12btdc, but there should be a decal under the hood or even on the engine itself that would list this info.
My guess would be between 1971 & 1972.
Mantrap - 1971 1972-05-29 was released on: USA: 29 May 1972
Arctic Co-operatives Limited was created in 1972.
Catlow - 1971 was released on: USA: 1 October 1971 Sweden: 24 January 1972 Finland: 17 March 1972 West Germany: 23 March 1972 UK: 30 March 1972 (London) Portugal: 18 April 1972 Denmark: 29 May 1972 Norway: 5 June 1972
1971 AFC Championship Game - 1972 TV was released on: USA: 2 January 1972
Because the previous system was very complicated and computers and calculators would have had difficulty calculating in the old system which was superseded by decimalisation in 1971.
Le casse - 1971 was released on: France: 27 October 1971 Japan: 4 December 1971 West Germany: 16 December 1971 Denmark: 27 March 1972 Finland: 31 March 1972 Spain: 1 April 1972 Netherlands: 27 April 1972 USA: 14 June 1972 Sweden: 24 July 1972 Norway: 7 September 1972 Turkey: 19 February 1973 Hungary: 26 July 1973