Gold Coins of 1971
Sovereigns and half sovereigns were not issued in every year, and this is one date for which none were issued.
Very few countries issued any gold coins in 1971, however we can suggest some alternatives.

Alternative World Gold Coins

Country	Denomination	Diameter	Weight	Alloy	AGW
Bahamas	$100	35	39.9400	.9166	1.1776
Bahamas	$50	28	19.9710	.9166	0.5888
Bahamas	$20	21.5	6.480	.9166	0.0188
Bahamas	$10	18.5	3.1950	.9166	0.0940
Bahrain	10 Dinars	28	16.0000	.9166	0.4717
Benin (Dahomey)	25,000 Francs	54	88.8800	.9000	2.5720
Benin (Dahomey)	10,000 Francs	37	35.5500	.9000	1.0287
Benin (Dahomey)	5,000 Francs	29	17.7700	.9000	0.5142
Benin (Dahomey)	2,500 Francs	25.5	8.8800	.9000	0.2569
Burma*	4 Mu	28	8.000	0.9999	0.2572
Burma*	2 Mu	21	4.000	0.9999	0.1286
Burma*	1 Mu	14.5	2.000	0.9999	0.0643
Chile	100 Pesos	32	20.3397	.9000	.5886
Colombia	1,500 Pesos	49	68.5000	.9000	1.9823
Colombia	500 Pesos	36	21.5000	.9000	0.6221
Colombia	300 Pesos	28	12.9000	.9000	0.3733
Colombia	200 Pesos	24	8.6000	.9000	0.2488
Colombia	100 Pesos	20	4.3000	.9000	0.1244
El Salvador	200 Colones	38	23.6000	.9000	0.6829
El Salvador	100 Colones	29.5	11.8000	.9000	0.3414
El Salvador	50 Colones	23	5.9000	.9000	0.1707
El Salvador	25 Colones	16	2.9400	.9000	0.0850
Haiti	200 Gourdes	39.5	39.4900	.9000	1.1427
Haiti	100 Gourdes	29	19.7500	.9000	0.5715
Haiti	50 Gourdes	22	9.8700	.9000	0.2856
Iraq	5 Dinars	28	13.5700	.9166	0.4001
Israel	100 Lirot	33	22.0000	.900	0.6366
Laos	80,000 Kip	49	80.0000	.9000	2.3151
Laos	40,000 Kip	38	40.0000	.9000	1.1575
Laos	20,000 Kip	28.5	20.0000	.9000	0.5787
Laos	8,000 Kip	23	8.0000	.9000	0.2315
Laos	4,000 Kip	17	4.0000	.9000	0.1157
Malaysia	100 Ringgit	27	18.6600	.9166	0.5502
Mauritius	200 Rupees	28	15.5600	.9166	0.4587
Monaco	5 Francs			0.9200
Oman	1 Ryal	37	46.6500	.9166	1.3755
South Africa	One Ounce Krugerrand	32.7	33.93	.9166	1.00
South Africa	2 Rand	22.05	7.9881	.9166	0.2354
South Africa	1 Rand	19.30	3.9940	.9166	0.1177
Uruguay	50 Pesos	23.5		.9166

Key
Denomination = Face value
Diameter = Approximate Diameter in millimetres.
Weight = Weight in grams.
Alloy = Fineness of gold.
AGW = Actual fine gold weight in troy ounces.