Silver Ounce 1979, Coin from Mexico

Coin	Silver Ounce 1979

La Casa de Moneda de México (the Mexican Mint) was established in 1535 and is the oldest mint in the Americas. Apart from manufacturing all the circulation coinage for Mexico, the mint also strikes coins in the internationally popular one troy ounce (1oz) of silver format.

Some of these are not legal tender and are issued as a "store of value" based on the intrinsic value of the precious metal they are made of; they are sometimes called "medallic coinage". The first of these were made in 1949.

The coins weigh 33.625, which at 92.5% ("sterling silver") purity means their pure silver content is 31.103, or exactly one troy ounce silver weight (ASW 1.000).

Mint	Mexican Mint	Mint Mark	Mo	Total Mintage	4,508,000 (4.5 million)

Obverse

The obverse of the coin shows at its centre a screw press with two flyweights, as used for coin minting before modern presses were introduced.

Around above, the name of the mint: CASA DE MONEDA DE MEXICO (the Mexican Mint).

Below left, the date of issue 1979.

The border is toothed, with staggered sizes of the teeth.

Obverse Inscription	CASA DE MONEDA DE MEXICO 1979

Reverse

The obverse of the coin shows at its centre a pair of scales as historically used to measure weight.

Around the rim, the inscription UNA ONZA DE PLATA PURA (one troy ounce of pure silver).

Above left, LEY .925 (purity 92.5%). Below the scales, PESO 33.625 GRAMOS (weight of 33.625 grams; "peso" in this context is "weight" and not the currency name).

Below that, the Mo mint mark of the Mexican Mint (large letter M above which a small o).

The border is toothed, with staggered sizes of the teeth.

Reverse Inscription	UNA ONZA DE PLATA PURA LEY .925 PESO 33.625 GRAMOS

Edge	Milled	Edge Inscription	None

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Silver Ounce 1979: Known varieties

Variety	Type IV
Images
Mintage	Issued: unknown
Details	On the reverse, the left scale pan points between U and N of UNA. Called "Type IV" or "Type 4" ounce (the regular design is called "Type III" or "Type 3", and on it the left scale pan points directly at the letter U).

All (4) coins of type: Silver Ounce (1 oz), Private Bullion

Coin Name	Mintage	Legend
Silver Ounce 1949	1,000,000	CASA DE MONEDA DE MEXICO 1949
Silver Ounce 1978	280,000	CASA DE MONEDA DE MEXICO 1978
Silver Ounce 1979	4,508,000	CASA DE MONEDA DE MEXICO 1979
Silver Ounce 1980	6,104,000	CASA DE MONEDA DE MEXICO 1980

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Silver Ounce 1979: Details

Country	Mexico
Coin Type	Silver Ounce (1 oz), Private Bullion
Issued	1979
Total Mintage	4,508,000 (4.5 million)
Material	0.925 Silver
Technology	Milled (machine-made)
Shape	Round
Orientation	Coin Alignment (Axis 6)
Size	41.5000 mm
Thickness	3.000 mm
Mass	33.6250 g
OCC ID	YRVP-OVRC-MKRJ-ODQG

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Silver Ounce 1979: Photos

Image	Details
	MEXICO, Onza, 1979 Mexico City - KM# M49b.3 Copyright: NumisCorner.com Notes: Type III. Source
	MEXICO, Onza, 1979 Mexico City - KM# M49b.3 Copyright: NumisCorner.com Source
	MEXICO, Onza, 1979 Mexico City - KM# M49b.4 Copyright: NumisCorner.com Notes: Type IV. Source
	MEXICO, Onza, 1979 Mexico City - KM# M49b.4 Copyright: NumisCorner.com Source

Silver Ounce 1979: Catalogue Reference IDs

Source	Reference ID
Krause, Standard Catalog of World Coins	Mexico KM# M49b.3 (Type III), M49b.4 (Type IV)

Silver Ounce 1979, Coin from Mexico - detailed information