http://www.ebay.com/itm/EDISON-PHONOGRAPH-MODEL-O-2-4-MINUTE-REPRODUCER-REBUILT-PLAYS-GREAT-/200940043348
Here is a model O reproducer serial number 491.
1. What year was the reproducer in the photo made?
2. What is unusual about the reproducer in the photo?
3. When did the first pot metal O tops come out?
4. What is the difference between an O, N, and N-56 R S top?
5. When did the dome tops come out?
Note: this has nothing to do with the seller, it is all about learning and this
is the best way to learn as it illustrates several important reproducer
principles I hope to make common knowledge.
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