Hi everyone! I have this Harding Memorial Issue stam, but I can´t determine if it is Scott 610 or 613. I have two and both are perf.11. I don´t know how to determine if they are rotary press or flat plate printing...thank you for your time and help!
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Harvey I think, therefore I am - I think! 29 Jul 2020 06:06:48pm
re: Is it Scott # 610 or 613?
Rotary is either wider or longer depending on which side is stretched as it turns. You need a good ruler since the difference is between 1/4 and 1 mm. The actual sizes depends on the stamp itself so I guess you'd need at least one of each to tell. Scott says 610 is 19 1/4 by 22 1/4 so I guess 613 is bigger - Scott says 19 1/4 by 22 1/2. So you need a damn good ruler!!!!
Dialysis, damned if you do...dead if you don't 30 Jul 2020 06:58:26am
re: Is it Scott # 610 or 613?
Put the ruler away, you cannot measure the difference. The dimensions that are given are too inexact, the tolerances too great, and user error too large for a ruler or caliper. Best dimensional method is to make a template out of an another stamp.
There are other (better) indicators for determining a flat plate vs. rotary printed US stamp. First is just the look of the stamp, with enough experience you can typically ID a flat plate stamp by their sharp, clean look (like yours). Another good method is to look for 'setoff' on the back of the stamp. 'Setoff' ink picked up from other stamps on a flat plate press when the still wet stamps were stacked (see link above). 'Setoff' does not always occur (I'd guess about 85% of the time) but is often enough to make it a good thing to look for first.
Lastly, I recommend that folks always start with the assumption that you have the most common variety.
You can also take a known flat plate stamp and cut the 4 corners off and lay it atop the stamp in question. You can see that the stamp in question is longer than the flat platr stamp.
He is looking for the answer that he has won the lottery. We see these types all the time. They say that they don't know, but when they get the answer, they say that they know better and everyone else is stupid. Then they move on to another forum to try to get one person to say that the stamp is the rare one. Then the stamp gets listed on ebay for a million dollars.
In the future, just say, "Well, the stamp could be the rare one. Send it in for expertization to verify."
Thank you all for your responses. Just to let you know, I am new at this forums, and I didn´t know that the same people were responding in both. I posted my questions at the same time, in both forums. Thank you for your time. It is not that your answers were not appreciated. On the contrary, I´m gratefull and willing to learn. I will put in practice all your methods and advice.
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a ruler.... 