...under maginifaction it looks like a flat topped "3" and a "0" to me Stu... but it looks like a hand stamped "30" that is slightly covered with metal discoloration from age and oxidation on that in-the-white part... that is the best I can make out considering the focus on that particular part...
I could be wrong...(my wife says I am all the time  ) but if it proves to be a "20" under better focus and magnification I would be surprised...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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