The opening dia. of a typical Common Sense milk bottle is 1 9/16" dia.
(above the ledge/seat)...so just over 1 1/2".  But, I don't know how
much 'slack' they had (I don't have a lid here to measure) - yet
wouldn't think slack would be a good thing, for keeping out airborne
'stuff'.  But, prior to ones being made with a tab to pull on (get the
lid out)...wouldnt the lids need to be of a material that the bottle
pick could dig in to...yet not break...since the lid was used to reclose
(wasn't it?).  

If these disks (or Pogs, ala Tim's comment) are hard rubber, they would
have broken at the first extraction.  Yes, the rubber could have been
flexible when new...but...was it...back then?  I am no antique rubber
expert, but am only familiar with the American Hard Rubber Co. that made
buttons, etc....back then.  Were items made of soft (flexible)
rubber...way back then?  
Would you want a rubber taste to your milk?  Hmmm.

Wouldn't poker chips have been decorative? Or had better logos...as
advertising?

Not trying to be negative...just like to turn over every stone (man, am
I tired; ha ha).

Carol

>-----Original Message-----
>From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]] On 
>Behalf Of Candace Ehringer
>Sent: Wednesday, September 12, 2007 11:36 AM
>To: [log in to unmask]
>Subject: Re: Weird disks
>
>I asked Bill Lindsey and he has never seen a closure on a milk 
>bottle quite like this. They are the right size, but the 
>material is wrong.
>
>
>On 9/12/07, Bob Genheimer <[log in to unmask]> wrote:
>>
>> Candace
>>
>> Could they possibly be milk bottle stoppers.  Most were made from 
>> heavy cardboard or cork, but these appear to be about the right size.
>>
>> Bob Genheimer
>> George Rieveschl Curator of Archaeology Cincinnati Museum Center
>> 1301 Western Avenue
>> Cincinnati, Ohio 45203
>> 513-455-7161
>>
>>
>> -----Original Message-----
>> From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]]On Behalf Of
>> Candace Ehringer
>> Sent: Wednesday, September 12, 2007 12:54 PM
>> To: [log in to unmask]
>> Subject: Weird disks
>>
>>
>> I have several rubber? (or possibly ceramic?) disks which came from a
>> privy or
>> trash dump next to a Los Angeles school cafeteria (ca. 
>1890s-1910s+). Has
>> anyone ever seen anything like them before? Six of them have "M & M"
>> stamped on both sides and one has "HQ" stamped on both sides. They
>> measure 1-1/2 inches in diameter and are 1/8 inch thick.  I would
>> appreciate
>> any help. My internet research has proved futile. Photos can 
>be viewed at
>> the
>> link below.
>>
>> http://www.flickr.com/photos/10925368@N07/
>>
>