3624 is an early one.  As per Edison there is no definate cut off regarding the 
ones without the gear cover.  The new model A appeared around 30,000 and yet I 
know of a suitcase around 42,000 and a bed plate around 44,000 with the raised 
lug.  
 
The armed C was made into 1907 for two reasons, Edison never wasted and to 
upgrade the carriage with the two clips an arm was needed.  The serial number 
of the C will let you know when it was upgraded.
 
Steve
 

> Date: Mon, 25 Mar 2013 20:49:31 -0500
> From: [email protected]
> To: [email protected]
> Subject: Re: [Phono-L] Interesting or Uninteresting Suitcase standard 
> observation.
> 
> It has a winged C and older style carriage thumbscrew. Serial #3624
> Bill
> 
> 
> On 3/25/13 8:23 PM, "Steven Medved" <[email protected]> wrote:
> 
> >
> >Hello Bill, What is the serial number of the Standard? The early ones do
> >not have a gear cover. Did it have a reproducer? Steve
> > > Date: Mon, 25 Mar 2013 19:56:46 -0500
> >> From: [email protected]
> >> To: [email protected]; [email protected]
> >> Subject: [Phono-L] Interesting or Uninteresting Suitcase
> >>standard observation.
> >> 
> >> I picked up a suitcase standard very inexpensively today (of the 2 clip
> >> variety). I got it and started to look at it and realized that it's
> >> mechanism is different than the banner model A standard. The spring
> >>barrel
> >> is smaller and appears to use a different spring and the turn off
> >> mechanism appears different and just presses on the governor yolk
> >>instead
> >> of having a felt brake of it's own. In addition, it appears no gear
> >>cover
> >> ever existed for this machine as there are no holes and no way to affix
> >> the model A 2 minute gear cover without drilling a hole. I thought the
> >> mechanisms were identical, so I guess it was just a bit of education.
> >> Bill
> >> 
> >> 
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