Hello and

!
As there are collectors on this Forum from all over the world, I'll leave some of the coins for others to identify as they will know those areas of numismatics better than me!
Here is my opinion of the following coins:
"British / Ireland / Isle of Man / British Guiana" selection:
Ireland sixpence (nickel)
Isle of Man 5 new pence (cupro-nickel)
Great Britain 3 old pence (nickel-brass)
Great Britain 10 new pence (cupro-nickel)
British Guiana 4 pence (silver)
"France / Spain / Guernsey" selection
Spain 5 centimos (aluminium)
Guernsey 4 doubles 1910H (bronze)
France 10 centimes Napoleon III (bronze)
France 2 francs 3rd Republic (aluminium-bronze)
France 50 centimes 3rd Republic (two - both silver)
"Unknown / Fake" selection:
1854 Great Britain halfpenny (copper)
1916 Great Britain threepence (silver)
1940 Great Britain farthing (bronze)
Replica of 1797 George III cartwheel penny, probably made in South Africa
I can't see anything of great value: the 1854 halfpenny is better than most and a British dealer might charge about £5 for it. The silver coins are all worth at least their metal content. The 1910 Guernsey 4 doubles is actually a very scarce coin (mintage 52,000) but they aren't widely collected so it's catalogued at only about £3 in the condition yours is in. The British Guiana coin is also quite scarce but again they are not widely collected and it's hard to read the date from the photo. The rarest date is 1923 with a mintage of only 12,000.