X-Ray Vision Question?

Broadstruck

Is there a Xray or Ultrasound type method to show proof that an overstrike occurred over another host coin?

Thanks in advance!

jmlanzaf

The host coin is on the surface. It can be imaged using surface visualization techniques. I'm not sure why you are suggesting something else.

amwldcoin

I always wondered if those glasses they offered in the magazines worked!

jmlanzaf

@amwldcoin said:
I always wondered if those glasses they offered in the magazines worked!

They worked for the people selling them....

Broadstruck

@jmlanzaf said:
The host coin is on the surface. It can be imaged using surface visualization techniques. I'm not sure why you are suggesting something else.

There's no remaining trace evidence on the centralized obverse/reverse remaining from the host coin.

It's the periphery and rims which does seem to show evidence of having been struck over a coin.

So, without some sort of Xray, no way of knowing exactly what coin was used as a planchet?

ricko

@Broadstruck .... I do not know of any generally used method that would yield that information... Perhaps an advanced metals engineer could give some information. I believe (just based on my metallurgical training - way below a dedicated professional) that the internal structure would be totally changed by the striking pressure. Some surface traces may remain just due to die surface structure. I hope someone with better credentials can give some input. Cheers, RickO

jmlanzaf

@Broadstruck said:

@jmlanzaf said:
The host coin is on the surface. It can be imaged using surface visualization techniques. I'm not sure why you are suggesting something else.

There's no remaining trace evidence on the centralized obverse/reverse remaining from the host coin.

It's the periphery and rims which does seem to show evidence of having been struck over a coin.

So, without some sort of Xray, no way of knowing exactly what coin was used as a planchet?

But what are you Xraying? You can't see through a metal coin. And this is not printing where you put new ink over old ink. The surface of your coin IS the surface of the old coin.

You might see some trace of the original surface in stress differences in the fields. But not sure how you would image that.

jmlanzaf

Wouldn't the weight and composition limit the number of possibilities?

LanceNewmanOCC

@Broadstruck said:
Is there a Xray or Ultrasound type method to show proof that an overstrike occurred over another host coin?

Thanks in advance!

.
one must think that if nic-a-date can essentially bring back a date and/or other features due to compression or lack of certain areas not degrading as quickly as those with less or more compression due to varying degrees of relief, some sort of density tester or the like should have some merit.

have you tried different lighting type, angles etc. it is amazing what can be seen/hidden with a myriad of lighting techniques. i have used light reflected off a say 8-10' ceiling, preferred white paint?, that would come back down the coin and show stuff not visible any other method i tried. good for finding otherwise undetectable schmutz but may work with over/under types silhouette(s).

this may or may not help.

savoyspecial

Weeklong bath in nic-a-date

kidding! don't try this...

vulcanize

@amwldcoin said:
I always wondered if those glasses they offered in the magazines worked!

Sony CCD-TRV 65 was one of those infamous Hi-8 camcorders released by Sony in 1998 that had a 0 lux nightshot capability. Someone found out that it works even in day time and can see through stuff if a filter was used.

Needless to say, Sony quickly moved to fix the nightshot switch and it did not work if there was any trace of light. In the early days of eBay, the original unmodded ones were selling like hotcakes.

amwldcoin

Dang! I actually think I have one of those in the basement. That was the 1st thing I used to put pictures on ebay. I bought a program which actually had a component you plugged into the motherboard of your computer. You could still frame a picture while you were moving the coin around and looking at it on your monitor with a click of the mouse. It was a great way to get an actual in hand look of a coin on your computer screen!

Wonder if it still works?

@vulcanize said:

@amwldcoin said:
I always wondered if those glasses they offered in the magazines worked!

Sony CCD-TRV 65 was one of those infamous Hi-8 camcorders released by Sony in 1998 that had a 0 lux nightshot capability. Someone found out that it works even in day time and can see through stuff if a filter was used.

Needless to say, Sony quickly moved to fix the nightshot switch and it did not work if there was any trace of light. In the early days of eBay, the original unmodded ones were selling like hotcakes.

WillieBoyd2