What can I do best and is permitted.

Dear fellow coincollectors, 

I finally finished with the transfer from catawiki/ lastdodo to numista.  I exported my list with coins in Excell to see which coins were not valuated. I have 184 coins without valuation. Can I add a valuation with the coin. I have 5 Krause worldcoins catalogue, 1600-1700, 1700-1800, 1800-1900, 1900-2000 & 2000-2015. Is that allowed? Or should my list be forwarded to a moderator? I like to get all my coins valuated if possibe. Thanks for your help.

Kind regards peter  aka dutch

Hello 🤖

Without pictures, it will be very difficult for anyone to help you. Could you please post clear pictures of each side of your item?

Please note that this is an automatic message. Feel free to ignore if it is not relevant.

Congratulations for getting your collection transferred.  

There are two values associated with each coin in your collection.  On the “My coins” page you have “My values” which is labeled “Buying price” in the Excel spreadsheet.  This is the value you entered when you added the coin.  It is meant to be the price you paid for the coin although some members probably use it to input a catalog value estimate.  Also on the “My coin” page you have a value “Estimate” which is derived from the values listed on each coin page.  In the spreadsheet it is shown under “Estimate” for each coin.  If there is no value for a coin then the value is blank.  The values on each coin page are derived from the “buying price” members entered plus some other things.  If one of your coins has this blank there is nothing you can do to add it in Numista but you can certainly put your own value in the spreadsheet if you like. 

Dear rsirian, 

Thank you for your reply. If I understand correctly, I can't send my valuationrequest to a moderator or country-expert or whatsoever. Furthermore, only if other collectors have the same coin as I then a valuation is possible? If you own rare or extremely rare coins without valuation there is nothing that can be done. 

I have coins that are valuated in the VF and XF sector, but I own an UNC and there is a blank and then nobody can get this coin valued? Or the other way, I owe a coin in VF, but only the XF and UNC are valued. Maybe I don't explain it correctly or my questions seem odd. I apologize I'm Dutch. Kind regards peter (dutch)

I'm assuming you want to add values that are Numista generated (on the coin page) and not the Buying price you input when you add a coin.

If I understand correctly, I can't send my valuation request to a moderator or country-expert or whatsoever.

No, that is outside the the duties of the (volunteer) moderators and (volunteer) country experts/referees.  You can submit requests for valuation of individual coins on this forum (please read the Forum policy first) but any valuation would not flow into the Numista generated value in the spreadsheet export.

Furthermore, only if other collectors have the same coin as I then a valuation is possible?

Yes, same coin and same grade, provided there are enough members to generate a value.

If you own rare or extremely rare coins without valuation there is nothing that can be done. 

Correct for the Numista generated valuation.  You can enter your own value (Buying price).

I have coins that are valuated in the VF and XF sector, but I own an UNC and there is a blank and then nobody can get this coin valued? Or the other way, I owe a coin in VF, but only the XF and UNC are valued.

Until enough members enter Buying price values for their coin/grade, Numista will not generate a value.  If you absolutely want to have a Numista generated value then one possible solution is to slide your grade estimate up or down to the closest one with a value.  If all the grades have no value then there's nothing you can do other than using your own value.

Maybe I don't explain it correctly or my questions seem odd. I apologize I'm Dutch.

You explained it quite well and not odd at all.  

Dear rsirian,  

Thank you very much for your detailed answer,  highly apreciated. You assume correct  that I like to add values for Numista generated pages. I collect over 45 years of coins and truly don't know what I paid for them. I will add the values manualy in the export excell sheet. Then I have at least one place with complete valuation of all my coins. It's a little bit pity that there's no possibility to add them yourself, with corrections if neccesary. It would be great imho to have an so complete as possible cataloque. Thank you again and I wish a nice evening. 

Kind regards,  peter

I think Numista requires a minimum number of people (i.e. 5) to enter a value for a coin/year/grade to present the “calculated” value (which I would assume is the average). So if you enter a value there's a chance that will be the one missing to actually enable Numista to do its magic, and in all cases it will help get one step closer to achieving this.

For rare coins that you or only a very very small number of people have, the values are also probably all over the place. I own a coin from the 1200s for which I've found auctions in the U$100 to 800 Euro range (the grades would not account for such difference in the ones I've found) so pinpointing an accurate value would likely be much harder. For rare coins I guess the true market value is what a buyer is willing to pay for it. 

My 2 cents 😀

Per Xavier:

Here are the rules for calculation.
 

1. Values are computed by type, year/variety and grade
    
2. A value is calculated only if at least 4 users entered a price for their coin
    
3. The value is calculated as the median of the values entered by the users
    
4. If a user entered several values, a median of his values is calculated and only the resulting value is used for the median calculation of step 3.                                                                                                                                                                                                                                                                                                     
5. Calculations are done in euro. Values entered by the users are converted in euro at the time they are entered. The display of the calculated value is converted to the user's currency at display time.
    

Also per Xavier:

The algorithm to compute prices has actually become a bit more complex than the explanation above, in order to give a bigger weight to recent values. Past auction sales (mainly from Heritage Auctions and Katz for the moment) are also taken into account.

Allowing only one member to define a value of a coin is very dangerous, since  bad sellers could do that to overprice their product and using Numista as a price reference.

Geison

Allowing only one member to define a value of a coin is very dangerous, since  bad sellers could do that to overprice their product and using Numista as a price reference.

 

 

Which is why the value does not use only one member and uses the medium and not the mean.

So if we are adding coins to a collection and there is no Estimated Value, does help if we put Buying Value so that over time it may work its way into Estimate Value? 

Correct! The site grows and becomes better with everyone’s collaboration