Below is from GPA Coin Analysis site verbatim. This site does require a paid membership but, one can enroll in a free 12 hour/20 visit trial offer through Heritage. While exploring the site, I found the information offered easy to access and follow. While this site targets investors, collectors can extrapolate or interpret past and present trends to form inferences on realized prices for future sales and purchases.
I am not selling this thing, just passing on valuable information. I wasn't sure where this belongs so; Mom and Dad please move to appropriate forum.
http://coins.gpanalysis.com/default.aspx"A man's judgment cannot be better than the information on which he has based it" (Arthur Hays Sulzberger).
The objective of GPAnalysis (the company also responsible for GPA for Comics), is to provide the rare coin collectors & investors with an on-line service that presents information [on sales realized] in a meaningful manner that is:
* intuitive and highly useful
* enables participants to make decisions based on knowledge
The GPA for Coins service has some very significant points of key differentiation to that of the current alternative services available. GPA for Coins is an on-line dynamic service vs. a static listing offered by all of the current alternatives. The on-line, real-time service provides market data based on actual sales results, updated shortly after the close of auctions.
GPA for Coins provides an unprecedented level of information to collectors/investors on the prices realized for rare coins. Extensive information can be obtained on a single coin: sophisticated summary reports and analysis [including charts] are instantly available.
What makes it really exciting and different from anything else available in the market place is that the data is interactive. You can set the parameters of the data set you wish to interrogate and then customise the output. Some of the many features available include:
* expand & collapse data sets
* select period data range
* deselect a coin(s) from a data set
* annotate a single coin sale
* add or remove high/low from charts
* include precious metal trends to individual chart
* add frequently searched coins to My Coin watch list
* manage a sophisticated portfolio of your investment