mcmlvif100
Well-known member
My two contributions. Neither one has any reference to warranty / EXP. The red 9450 is Chicago with date code of 12 - 53. The multi-colour 4 inch is Schiller Park with a date code of 6 - 69.
here's one that has been talked about on the vise thread lately and the craigslist seller was nice enough to post a picture of his slide for us. it's the earliet Guar Exp date I've seen so far with June 30, 1955.
Since it reads "Pat Pending" on the vise, it would be valid IMHO to set the mfg date at 1940. Clearly by 1945 the castings read "Chicago" and the Pat Pending was gone.
BTW, do the jaws have serrations or just lines?
I think that would be the actual date...1945. My understanding is that later on there were some models that added 5 for the warranty, but not in the 40s.

Quote:
Originally Posted by Mark in Indiana View Post
Here is my Wilton 840 vise. It has patent pending on the body cast and a date stamp of 11-45. I understand Wilton was awarded the patent for the bullet vises in '41.
Which begs the question...was it manufactured in '45 or '40?
I think that 1945 would be the actual date, according to my research. My understanding is that later on there were some models that added 5 for the warranty, but not in the 40s.
Qoute AFAIK, the patent for the Wilton was awarded in March, 1942, so it seems unlikely that a Chicago vise would still have a "Pat Pend" casting in the mid-40's. I think the gray area for adding 5 years for the warranty was around 1946-1947.
My 2.5 has Chicago on the side yet a date stamp from the 70s. It is very confusing. Some bodies were sold years later it seems.
until those are close to being used up, no need to re-cast.exmaxima1: I am confused. If the company started in 1941, how could the pat pending vise code dated 1945 (allowing a 5 yr warranty) be a 1940 if the company did not yet exist? I had suggested that 1945 is the actual date...and that it is plausible that bodies were mixed up and sold in different years in the 40s.
AFAIK, the patent for the Wilton was awarded in March, 1942, so it seems unlikely that a Chicago vise would still have a "Pat Pend" casting in the mid-40's. I think the gray area for adding 5 years for the warranty was around 1946-1947.
Further, if the vise has no "Pat Pend" on it yet a stamp date of 1946, it does not seem plausible that it could be a 1941 vise. Or even more confusing are those with 1945 dates----subtracting 5 years would place its birthday before Wilton was founded (1941).
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Except that the earliest date we have listed here is 4-1945, (KMScott's) several that are "Patent Pending" The latest of those is 12-46, and by 1/46, no Patent Pending...
All yours you said were mid to late 40's
Wilton started in 40 or 41 (I think the incorporation date was in 41, but that does not mean they weren't started before that...) and the patent was granted in 41.
With the limited empirical proof so far, they started by stamping the warranty expiration...
Among some of my wiltons that have Chicago but do not have pat pending...I have several 1945 dates and one 1946 date. My other number 3 that has pat pending does not have a date stamp.
Among some of my wiltons that have Chicago but do not have pat pending...I have several 1945 dates and one 1946 date. My other number 3 that has pat pending does not have a date stamp.
Ex: the owner of Junkyardtools website is a member here and i think it's Steve and sorry i can't remember his exact handle. it does include Steve though so might be SteveO or the other Steve name.
Steve told me when i PM'd him months ago that when he wrote that he just copied it off another guy's post probably from Vintage Machinery or some other forum. he said he wasn't sure it was 100% correct hence me, you and all the guys on GJ trying to figure out the answers.
I used the history posted here:
http://junkyardtools.com/tool_history/wilton
It lists 1941 as founding year (same as Wilton's own website: http://www.wiltontools.com/us/en/company/history/), 8/1/41 for patent application, and 3/3/42 for patent approval. I think the warranty stamping dates are all over the map during the early years. Autoprts is a guru on Wiltons, and even he can't make heads or tails of it. Hopefully this thread, over time, will ultimately glean some definitive information.
From 1941 through 1945, the new Wilton 40S machinist vise was manufactured in Chicago and sold solely to the US Government. Most vises were used in munitions factories or in manufacturing of equipment used during WWII.
I can now see that many of the inconsistencies are flawed from basing on Steve's site. And I have fallen into that trap in a few of my responses.
Yet the founding date seems to be the main issue: is it 1940 or 1941? Wilton's site claims it is 1941, and most companies would go older if they were fibbing, so I tend to think that is a valid date. The site also talks about building vises throughout WWII, and that much of the surplus flooded the market after the war ended. They would not put warranty dates on military parts, and likely not any stamping (per Autoprts), so it is possible that all the surplus was stamped after the war. There could easily be a blend of old and newer style vises all being stamped with similar dates during that period.
Possible??
I've yet to see a vise stamped prior to 1945 so until i do maybe that is the actual year they started dated their vises. then as the company grew a bit and more competition in the public market they offered the 5 year Guar/EXP stamps until vises sat on shelves a bit too long and they went back to actual date stamps in the 60's.
anybody have a stamp on their Wilton from 1940-1945 that they didn't put there themselves?
Ok, so here's a good question: If the above number 3 Chicago pat pend is stamped 45 and we think it is a 1940, what year is my Chicago number 3 - also stamped 45 - which does NOT have the pat pend mark?
Ok, so here's a good question: If the above number 3 Chicago pat pend is stamped 45 and we think it is a 1940, what year is my Chicago number 3 - also stamped 45 - which does NOT have the pat pend mark?

What MONTH is your date?
early 1940 was probably no pat. applied for, later could have been after the pat. was applied for, hence "pat pending"
So you are saying that the earliest vises could be the "no pat pend" Chicago era, and then they went to Pat Pend, and renamed the vise to a Number scheme (such as No. 3, No. 4, etc), and then they went back to "no Pat Pend" Chicago, and regular model numbers (ie, 830, 840) again?
I'll have to think about that...
) they MAY have left it off due to space constraints.