Identification Speedometer Stewart Warner 407601

[htc]

Hello,

I am working on many different jeep speedometers.
I have a Stewart Warner speedometer that I suspect to not be WWII but I am puzzled by the type indication on the body.
The indication is 590 AM M..

I think the last M stands for 1944. Somewhere I did read that K was 1942.

Included some pictures:







I did search for the 407601 and for the B-208454 but did not find anything.
Somebody knows more?

Greetings
Hans

[Bill H.]

Looks like an early M series speedometer.

[htc]

Looks like an early M series speedometer.

Hello Bill
Thank you for the fast answer. Yes, M38 is what I did think also. But then it can not be 1944.
Strange that there is no info about speedometers used in the M38 or maybe I do not look in the right locations.
Anyway, for those interested in restoring WWII Stewart Warner speedometers: the parts are similar to the WWII speedmeter parts so can be used to restore the late (because of the form of the odometer rolls) WWII Stewart Warner speedometers.
Is there somebody who can confirm the link between M and 1944 or between L and 1942? Or do I have it wrong?
Greetings
Hans

PS. I have been looking in the M38 section. Original speedometers for M38 are AC. Later, Stewart Warner was used with the M-38A1 but the dial was different.

PS2. And unless I am mistaken, the M38 speedometers did not have a trip meter?

PS3. In the Feb 1944 TM on speedometers the speedometer model number 590 AM is described so I guess it "IS" WWII and indeed 1944 but where was it used?

PS4. The glass retainer on this model is rubber and this is different from the metal glass retainer with paper gaskets one finds in 'normal' SW speedometers.

[Bill H.]

GPA???

[Raflad]

M4

[Klaas]

Hi Hans, K stands for 1942. I have the original SW speedometer marked K3 in my April 1942 GPW.

[htc]

M4

Hello Raflad,

I think you nailed it!
I am impressed. Thanks.

It also explains the thick rubber glass retainer probably to better protect the glass from shocking rides. And it explains the green cut out sections in the body to allow a light in the back of the dashboard to illuminate the dial (as I suspect a Sherman tank interior to be pretty dark).

Greetings
Hans

[htc]

K stands for 1942. I have the original SW speedometer marked K3 in my April 1942 GPW.

Nice.
Your speedometer was made in March, one month before your jeep.
Top. Does it work like it should? I see you took it apart...
It is 590 AD K3, I guess. (The 5 is not visible on the picture).

Greetings
Hans

[Klaas]

Hi Hans,

Yes it is a 590 AD K3 long needle SW and the speedometer works like new and is very accurate after I took it apart using the information on this forum as a guide.
It was very stiff before so I did not want to risk using it before a good clean and some new lubrication.
As the rim was damaged, I knew it had been taken apart before and to my great surprise I found a date and recorded mileage written in pencil on the inside of the case.
(Before assembly I added the new date and then current mileage for posterity.)

[htc]

PS4. The glass retainer on this model is rubber and this is different from the metal glass retainer with paper gaskets one finds in 'normal' SW speedometers.

Hello

Correction!

Today I took apart another late war (short needle) Stewart warner speedometer. A normal 403261.
It also has the rubber glass retainer and a rubber gasket between the glass and the bezel, so the rubber is not an Sherman tank M4 related thing but a standard Stewart Warner speedometer component. No paper gaskets as used in the King Seeley and the Motometer.

I should have known from the TM

Stewart Warner:



King Seeley:



Motometer/Waltham:



Greetings
Hans