Here's a picture of the earliest English half-penny stamp. There were probably others later. http://www.stampwants.com/Great-Britain-58-Mint-OG-Fine-Sound-Plate-11-CV-110_QQitemnameQQ2836088QQidQQauctiondetails
You could try a coin and stamp dealer, or you could try your local library and look for Stamp Catalogues for the country you are interested in. Stanley Gibbons catalogues would be especially good for British and British Empire/Commonwealth countries.
what do shake look like
Exactly like any other US Stamp.
Too many variables. You need to fully identify the stamp you are interested in, some things to figure out: What was the country of issue? Was the stamp canceled in 1913? or does it commemorate something that was made in 1913 and has that date in the design? What condition is the stamp in? Is the stamp used or look like it just came from the post office? Consult a stamp catalog online or at your local library.
To many variables. You need to fully identify the stamp you are interested in, some things to figure out: What was the country of issue? Was the stamp canceled in 1913? or does it commemorate something that was made in 1913 and has that date in the design? What condition is the stamp in? Is the stamp used or look like it just came from the post office? Consult a stamp catalog online or at your local library.
By the make stamp What should the stamp look like?
The Swedish 1858 Treskilling Stamp has a yellow-ish color to it and appears to be very old looking. Though you can not find it in the USA, some lucky stamp collectors would pay half a million dollars for this treasure.
It looks exactly the same as the 2010 or 2012 penny.
The ones I just got for a kidney stone causing pain are round, flat on top and bottom and perhaps half the size of a penny.
The US coin looks very much like a modern US penny
They are like any other stamp.
Obverse: Head facing left, with GEORGIVS VI D: G: BR: OMN: REX F: D: IND IMP surrounding it. Reverse: Ship (The Golden Hind) heading left, HALF PENNY above, date below.