The reproducer top is an R's top from 1911, the bottom is also likely from 1911 or later. 12673 is the highest iron and brass top I know of, 13028 is the lowest pot metal top I know of. Both of the dome tops appear in the 41,000 range, the raised letter dome top is rarely found below 50,000.
The O and N share serial numbers, the N joined in around 22,000, the O dropped out around 65,000. The R and S are merely large tops with a shoe adapter to fit the small carriage. The R and S share serial numbers. The N-56 is found with R and S serial numbers. It is my theory that when Edison stopped making the R and S he used up tops that were intended for the R and S. Just over 30,000 R and S reproducers were made, the S joined in around 13,300. The top is from a Model R, the pointer appeared around 9800 and the large O appeared around 5900. The holes in the tops that were tapped 1-64 to hold the shoe adapter to the R and S the top on did not appear on the Model O reproducers until the 41,000 range when the dome tops appeared and Edison made the tops universal so they could be made into an O N R or S. I have even seen two iron and brass O tops made into Model N reproducers. > To: [email protected] > From: [email protected] > Date: Fri, 12 Jul 2013 03:55:34 -0400 > Subject: Re: [Phono-L] My Attempt at Model O reproducer quiz > > > 1. What year was the reproducer in the photo made? > > Steve, is that a trick question? I think that O was put together from parts > in 2013. > > > 2. What is unusual about the reproducer in the photo? > > > The serial number is from the R and S Reproducers. The weight has the large O > which was later. > The thumb knob has a pointer which an early brass topped iron body with a low > serial number > would not have had. The pointer came along many many thousand later than 491. > An original O body should have a milled cove in the body rim for the carriage > arm locking screw > to hold the Reproducer in place. If the body were an N there would be that > milled cove also. > 3. When did the first pot metal O tops come out? > > Sometime after serial number 12462 and before 13340; > but, as a date, I would hazard a wild guess that it was for the Home E in > March 1911. > > 4. What is the difference between an O, N, and N-56 R S top? > Hole placement, number of holes for screws, and limit pin thread pitch. > I know I am missing a lot but I am too lazy to go grab a bunch for comparison. > > > 5. When did the dome tops come out? > I have a potmetal dome N serial 17612. Since they were announced in November > 1911, > I would guess January 1912. It is late and my brain is on idle so I know > that's wrong. > > Like many sellers on eBay the description was written just to have something > to read. > Any factual semblance to reality is purely accidental. > Too many sellers are downright misleading to con newbies into buying their > junk. SAD... > > OK Steve, I await your comments to be enlightened and educated. > > 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. > > > > > Thanks for the brain exercise, I look forward to the answers, > Al > > > _______________________________________________ > Phono-L mailing list > http://phono-l.org _______________________________________________ Phono-L mailing list http://phono-l.org
