Well Rob,
To be honest, the best bet is to take your watch to a knowledgable
vintage/antique pocket watch repairman/collector. There are so many
variables in determining the history and value of a watch that you can very
easily get the wrong information. I strongly recommend taking it to a
professional. Most will look at it for free. And then tell you it
needs cleaning for a small fee:)
In the case of the Keystone Watch Company, I ASSUME that it is
the Keystone Standard Watch Co.. If so, here is what I know. It
comes straight from the "Complete Price Guide to Watches" No. 19 (an
extremely valuable book to the pocket watch/wrist watch collector and only costs
$27).
Keystone Standard Watch Co.
Lancaster, Pennsylvania
1886 - 1890
Abram Bitner agreed to buy a large number of stockholders' shares of the
Lancaster Watch Co. at 10 cents on the dollar; he ended up with 5,625 shares out
of the 8,000 that were available. Some 8,900 movements had been completed
but not sold at the time of the shares purchase. The company Bitner formed
assumed the name of Keystone Standard Watch Co. as the trademark but in reality
existed as the Lancaster Watch Co. The business was sold to Hamilton Watch
Co. in 1891. Total production was 48,000.
Since they only produced (or the guide only lists) 10 types I'll list them
here.
Description
Avg. Ex-Fn Mint
1. 18s, 7-15j, OF,
KW $100
$120 $200
2. 18s, 7-15j, OF, SW, 3/4,
LS 70 100 150
3. 18s, 15j, dust proof,
ADJ 100 120
225
4. 18s, 11-15j, dust proof, OF
100 125 175
5. 18s, 11-15j, dust proof, HC
120 150 225
6. 18s, 17j, dust proof,
HC 150 175
250
7. 18s, 20j, dust proof, HC **
300 450 600
8. 18s, West End, 15j,
HC 85
125 175
9. 8s, 11j, dust
proof
100 125 175
10. 6s, 7-10j,
HC
* 100 140 250
Legend:
18s refers to the size of the
watch. Size 18 means that the movement itself is 1 23/30 inches in
diameter.
7-15j refers to watches with anywhere from 7
to 15 jewels
OF means open face case (no metal
cover over the dial)
HC means hunter
case (metal cover over the dial)
KW means Keywind.
Watch requires a key to wind it up.
SW means Stemwind. Watch
winds from the stem (like a timex wristwatch)
3/4 means that the three
quarters of the movement is covered up by a plate as opposed to full
plate.
LS means that the watch is
lever set. In order to change the hours and minutes, you need to pull a
lever first.
The lever is
normally located on the watch dial at the 10 or 2 o'clock position and moves in
and out of the watch.
* Uncommon - Only
about 2,500 known to exist
** Scarce -
Only about 1,000 known to exist
Also, the "West End" on item 8 is known as
a movement name. In the case of this watch, not only does it say Keystone
Watch Co., but it will also say West End on it as well. The prices listed
are the prices paid on average for Average, Extra-Fine and Mint condition
watches. Special circumstances can change the worth of your
watch.
And finally, the numbers you saw on the case or
movement are indeed serial numbers. The number on the movement is usually
much more important that the number on the case itself. Movement serial
numbers are normally used to determine the age of the watch, and in some cases
will also indicate the actual model of the watch (if someone has a production
serial number model list for that particular company).
Hows that for some information? ;)
Michael P. Smith