It really just depends where you are located. Get several opinions and educate yourself on what coins you have. Avoid "Cash 4 Gold" places. Keep in mind that coin dealers are resellers and despite the fact that the coin might be selling for, say, $30 on eBay, a coin dealer might only pay you $20 for that coin. If you want the most money, you must sell your coins yourself, but to do that you have to be very educated in what your coins are.
If you don't know anything about coins, then the first step should be to take the collection to a coin dealer to get an appraisal.
The value of any collection depends upon the condition of the coins it contains. I would suggest you take the collection to a coin dealer or two and get an estimated value.
With difficulty. The British Halfcrown coin has been issued since 1526. Are your coins circulated (what condition are they in), mint uncirculated, or Proof? Do you have a full range issued for a particular king or queen? Do you have an example of every coin issued between certain years? Does your collection include varieties? I suggest that you take your collection to a reputable coin dealer in your area and ask for a valuation.
It's value depends on what coins are in the 'collection' and the grades (condition) of them. It needs to be seen. Take it to a coin dealer for a value.
Each coin will have to be graded an assessed for a value. Take it to a local coin dealer or collector for a better idea of the value of the coins.
A coin collection is generally not considered a liquid asset because it may take time to sell and convert into cash. The liquidity of a coin collection depends on factors such as demand, rarity, and market conditions. While some coins may be easily sold, others may require more effort and time to find a buyer. Therefore, while it can have value, it does not offer the immediate cash accessibility that liquid assets like cash or stocks provide.
It's very hard to give a value for an unseen set of coins. Each coin would have to be graded an given it's own value. Take the set to a couple different coin dealers for an idea of value.
7-28-11>>> From the range of dates, the collection is likely in a Whitman Coin Folder Number Two. If the collection is complete, this folder holds 90 coins that includes the 1970-S Small Date variety, which is the only coin of any value, especially if the coins are circulated. As for a value? The collection needs to be seen. Take it to a coin dealer, but if the 1970-S small date is missing, don't expect much if any thing. Unfortunately, with most of the collections like this I see, the folder is worth more than the coins.
A collection is difficult to evaluate sight unseen. Silver Threepences ceased to be minted in 1945, and the 1942 to 1945 coins were only minted for colonial use, so presumably you have a collection of dodecagonal nickel brass Threepences without the 1947 coin, which was not minted. Are the coins circulated, uncirculated or Proof? Based on the assumption that your Threepence collection consists of circulated dodecagonal nickel brass coins in excellent condition, you might get up to £130 GBP. I suggest that you take your collection to a reputable coin dealer will be able to give a more accurate valuation.
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Take it to a coin dealer
Take it to a coin specialist or a coin collecting shop. Or send it in by mail to an appraising company. Look on Google for the locations of these stores.