The French Napoleon Ist and Napoleon IIIrd gold coins are highly collectible. The 20 francs are the most easily available, although the 40 franc coins show up occasionally.  
1806 GOLD 40 FRANCS *TURIN* FRANCE = NAPOLEON - RARE =

1806 GOLD 40 FRANCS *TURIN* FRANCE = NAPOLEON - RARE =

Price: $385.00
1809 GOLD 40 LIRE MINTMARK ITALY-NAPOLEON = RARE =

1809 GOLD 40 LIRE MINTMARK ITALY-NAPOLEON = RARE =

Price: $290.00
1859 gold 20 franc Napoleon emporer

1859 gold 20 franc Napoleon emporer

Price: $147.09
1862 Napoleon III Empereur France Gold Coin Miniature

1862 Napoleon III Empereur France Gold Coin Miniature

Price: $2.99
Napoleon III 1855-A BLAZER GOLD 20 FRANCS Near Melt

Napoleon III 1855-A BLAZER GOLD 20 FRANCS Near Melt

Price: $179.99
23 French Napoleon III 18k Gold Coins & Pearls Belt

23 French Napoleon III 18k Gold Coins & Pearls Belt

Buy It Now: $7,900.00
ANTIQUE RARE NAPOLEON III 1856 -60 GOLD COIN BRACELET

ANTIQUE RARE NAPOLEON III 1856 -60 GOLD COIN BRACELET

Buy It Now: $1,899.00
NAPOLEON III EMPEREUR GOLD COINS

NAPOLEON III EMPEREUR GOLD COINS

Price: $0.99
1808 GOLD 20 FRANCS FRANCE = NAPOLEON - AUNC ++ =

1808 GOLD 20 FRANCS FRANCE = NAPOLEON - AUNC ++ =

Price: $144.50
EMPIRE FRANÇAIS NAPOLEON III RARE GOLD 10 FRANCS 1866

EMPIRE FRANÇAIS NAPOLEON III RARE GOLD 10 FRANCS 1866

Price: $99.95
LAUREATE 1808-A Paris NAPOLEON BONAPARTE Gold 20 Francs

LAUREATE 1808-A Paris NAPOLEON BONAPARTE Gold 20 Francs

Price: $127.50
LOVELY 1814-M Kingdom of Italy Napoleon Gold 40 Lire

LOVELY 1814-M Kingdom of Italy Napoleon Gold 40 Lire

Price: $152.50
1811-A FRANCE GOLD 20-FRANCS OF NAPOLEON BONAPARTE

1811-A FRANCE GOLD 20-FRANCS OF NAPOLEON BONAPARTE

Price: $127.50
UNC 1856-A EMPEROR NAPOLEON III Gold 50 Francs

UNC 1856-A EMPEROR NAPOLEON III Gold 50 Francs

Price: $415.00
UNC 1812-A Paris NAPOLEON Gold 40 Francs

UNC 1812-A Paris NAPOLEON Gold 40 Francs

Price: $710.00
ANTIQUE RARE NAPOLEON III 1856 -60 GOLD COIN BRACELET

ANTIQUE RARE NAPOLEON III 1856 -60 GOLD COIN BRACELET

Buy It Now: $1,899.00
#47 1808 LOT SILVER & GOLD FRENCH NAPOLEON FRANCE COPY

#47 1808 LOT SILVER & GOLD FRENCH NAPOLEON FRANCE COPY

Price: $0.99
1864 Napoleon III Gold Coin

1864 Napoleon III Gold Coin

Price: $150.00
1813 Q 20 Francs Napoleon Gold Coin Perpignan NGC XF45

1813 Q 20 Francs Napoleon Gold Coin Perpignan NGC XF45

Price: $497.00
1854 NAPOLEON I EMPEREUR ROI FRENCH GOLD BRASS RARITY

1854 NAPOLEON I EMPEREUR ROI FRENCH GOLD BRASS RARITY

Price: $0.99
1863-A FRANCE 20 FRANCS "NAPOLEON" GOLD COIN

1863-A FRANCE 20 FRANCS "NAPOLEON" GOLD COIN

Price: $137.50
1868-BB FRANCE 20 FRANCS "NAPOLEON" GOLD COIN

1868-BB FRANCE 20 FRANCS "NAPOLEON" GOLD COIN

Price: $138.50
1810 Napoleon Gold 20 Franc France

1810 Napoleon Gold 20 Franc France

Price: $210.00
1858 Gold 20F Napoleon III

1858 Gold 20F Napoleon III

Price: $220.00
France 20 Francs 1854A Napoleon III bareheaded Gold EF

France 20 Francs 1854A Napoleon III bareheaded Gold EF

Price: $20.50
20 FRANCS GOLD COIN NAPOLEON III 1852-A PARIS MINT

20 FRANCS GOLD COIN NAPOLEON III 1852-A PARIS MINT

Buy It Now: $230.00
1855 A 20 Francs France Gold Napoleon III

1855 A 20 Francs France Gold Napoleon III

Price: $0.99
1868 BB 20 Francs France Gold Napoleon III

1868 BB 20 Francs France Gold Napoleon III

Price: $0.99
Napoleon III 1858-A BLAZER GOLD 20 FRANCS Near Melt

Napoleon III 1858-A BLAZER GOLD 20 FRANCS Near Melt

Price: $179.99
Buy It Now: $182.00
ANTIQUE RARE NAPOLEON III 1856 -60 GOLD COIN BRACELET

ANTIQUE RARE NAPOLEON III 1856 -60 GOLD COIN BRACELET

Buy It Now: $1,899.00
1814-M Italy 40 Lire NGC XF40 Napoleon .3733 pure gold

1814-M Italy 40 Lire NGC XF40 Napoleon .3733 pure gold

Price: $261.50
1806-A France 40 francs Napoleon NGC XF45 .3734 oz gold

1806-A France 40 francs Napoleon NGC XF45 .3734 oz gold

Price: $295.00
1811 K 40 Francs Napoleon Gold Coin Bordeaux NGC AU50

1811 K 40 Francs Napoleon Gold Coin Bordeaux NGC AU50

Price: $480.00
1857-A France 50 francs NGC AU55 Napoleon .4667 oz gold

1857-A France 50 francs NGC AU55 Napoleon .4667 oz gold

Price: $11.50
1811-A France 40 francs Napoleon NGC VF35 .3734 oz gold

1811-A France 40 francs Napoleon NGC VF35 .3734 oz gold

Price: $10.50
1812-A France 40 francs Napoleon NGC VF35 .3734 oz gold

1812-A France 40 francs Napoleon NGC VF35 .3734 oz gold

Price: $102.50
#47 1808 LOT SILVER & GOLD FRENCH NAPOLEON FRANCE COPY

#47 1808 LOT SILVER & GOLD FRENCH NAPOLEON FRANCE COPY

Price: $0.99
1812 A 40 FRANC FRANCE GOLD NAPOLEON BONAPARTE NGCXF45

1812 A 40 FRANC FRANCE GOLD NAPOLEON BONAPARTE NGCXF45

Price: $202.50
1811 GOLD 20 FRANCS FRANCE = NAPOLEON - AUNC =

1811 GOLD 20 FRANCS FRANCE = NAPOLEON - AUNC =

Price: $0.99
(a1worldtrading) 1855-A Napoleon III 20 FRANCS GOLD

(a1worldtrading) 1855-A Napoleon III 20 FRANCS GOLD

Price: $0.99
SCARCE VARIETY 1811-A Paris NAPOLEON Gold 40 Francs

SCARCE VARIETY 1811-A Paris NAPOLEON Gold 40 Francs

Price: $113.50
Antique 1806 20 Francs French Napoleon Gold Coin

Antique 1806 20 Francs French Napoleon Gold Coin

Price: $86.00
CHOICE AU 1808-M Kingdom of Italy Napoleon Gold 40 Lire

CHOICE AU 1808-M Kingdom of Italy Napoleon Gold 40 Lire

Price: $113.00
NICE A.U. 1806 Gold 20 Francs of NAPOLEON BONAPARTE

NICE A.U. 1806 Gold 20 Francs of NAPOLEON BONAPARTE

Price: $113.50
ALMOST UNCIRCULATED 1812-A NAPOLEON Gold 20 Francs

ALMOST UNCIRCULATED 1812-A NAPOLEON Gold 20 Francs

Price: $119.50
Year 12 (1803-04) NAPOLEON "Empereur" Gold 20 Francs

Year 12 (1803-04) NAPOLEON "Empereur" Gold 20 Francs

Price: $113.50
The French Napoleon 20 franc and 40 franc gold coins are amongst our favorite and we highly recommend them. We recommend you buy graded coins preferably graded by PCGS or NGC graded coins.