How does one go about figuring out mid-grade Greysheet values?

Rampage

Take for example an 1891-P Morgan dollar. Looking at a Greysheet from April 15, 2005, MS60 is 38/42 and MS63 is 125/140. So, is there a percentage to use to figure MS61 and MS62 grades?

Here is another example. An 1893-O Morgan dollar in AG, or even P. Greysheet list the coin at 135/145 in VG. So, how would you go about figuring G, AG, FA, and P?

Thanks, Richard.

Coxe

The grey sheet is not THE authoritative price guide for coins, but one particular guide. You could use other sources, like auction prices realized. Heritage's archives are pretty extensive and easy to use. (You probably won't fing the P or AG dollar there though.) If you want to stay with the CDN family of pubs, you could use the blue sheet for the 61. The PCGS blue sheet price is usually lower than the grey sheet price. Just use the ration of the MS63 prices for the coin as an appropriate multiplying factor. OTOH MS61 for a raw coin is subjective (not that for a slab -anyone's slab- it is not). Someone else might see it as a 60 or a 62. There just is no hard and fast rule. If a coin is average for the grade and is a commonly traded issue in that grade, then the sheet is applicable.

wayneherndon

Agree there is no hard and fast rule. Typically, however, the price is closer to the price for the lower grade than to the price for the higher grade.

ziggy29

There's really no rule. Between two consecutive grades, I think the geometric mean is usually a reasonable rough estimate.

If a coin is listed at $100 in F-12 and $400 in VF-20, an F-15 (the intermediate grade) might be close to the geometric mean of 100 and 400, which is $200.

To get that, solve the following: (100 / x) = (x / 400).

Cross-multiplying, you get x^2 = 40,000, or x = 200.

It's a little tougher when there are multiple intermediate grades. There, geometric interpolation might come close, but it's more complex. And as these are only rough estimates, I usually eyeball it and figure out a reasonable price -- usually somewhat closer in value to the lower grade than the higher grade.