Coin valuations

[Gary D 76]

This is really a question for Chris but if anyone else has an opinion please chip in.

Chris, how do you adjust your coin valuations on a yearly basis from one edition to the next. Is there some formula that can be applied such as multiply everything by a percentage or is it much more fluid than that. The reason I ask is that I have a large speedsheet listing my entire collection, about 1000 coins and I last priced it up using Spinks 2007 which I assume is getting a bit out of date by now so I need to do a bit of adjusting.

My second question is, is there a way of determining the value of the in between grades from the two either side. Say for instance a GVF or GEF from VF/EF and EF/UNC respectively.

Thanks

Gary

[Chris Perkins 228]

There probably is some kind of mathematic formula which may fairly accurately allow you to increase the values for each coin type in each grade. And, also something similar for the inbetween grades.

If there is, I'm not clever enough to have worked it out yet, so I do the values manually based on printed sales lists etc.

For inbetween grades you just have to be instinctive and put the value in the middle somewhere, judging on eye appeal and how far away it is from the next full grade etc.