Information: Visual Differences - A-6370 & PSC BU43 Lunettes

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Chance
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Information: Visual Differences - A-6370 & PSC BU43 Lunettes

Post by Chance » Sat Feb 04, 2017 2:30 am

Just a few photos comparing WO A6370 marked and PSC BU43 marked lunettes.

A6370 doesn't appear to have been used. A-6370 on the left and PSC BU43 on the right.

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A-6370 on the left and PSC BU43 on the right.

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A-6370 on the left and PSC BU43 on the right.

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PSC BU43 on the left and A-6370 on the right.

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Bill H.
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Re: Information: Visual Differences - A-6370 & PSC BU43 Lune

Post by Bill H. » Sun Feb 05, 2017 4:44 pm

Sweet!
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Re: Information: Visual Differences - A-6370 & PSC BU43 Lune

Post by Chuck Lutz » Mon Feb 06, 2017 9:31 am

To start with...the A-6370 marked one is obviously for the MBT. There is no record that one so marked was or wasn't used on any other mfger G-529. The PSC BU42 and PSC BU 43 show up on Bantams....and the Willys MBT. Obviously there is no PSC BU41 for the G-529 as they didn't make 'em in 1941. But I've never had a PSC BU44 or a PSC BU45 reported in my data base either and if you recall, Willys last production of the G-529s ends in March 1944 so they might very well have been a supplier to Willys as well.

Furthermore....the ones with "A-6370" have a number/letter suffix following the A-6470 such as "1B" or "2C" or "3B". There is often what I think is a foundry mark that proceeds the "A-6370" or follows the "2B" markings which is a larger serif-font letter at an angle.

As to the "841-3" markings, they show up as well...not many but a few.

The" QCD B43" marking has been reported on an MBT, a Bantam and a Checker Cab which didn't even get a CONTRACT until 1945.

However gentlemen....while we do find rebuild tags on the trailers from the 229th in Japan, or Pacific Builders for instance...so many trailers in my data base have the "wrong springs" or Willys shock/spring bottom plates on Bantams or vice versa...that I would not be surprised to learn that the Lunettes were mixed up as well.

So...while the A-6370 marking makes it easy for an MBT owner to know what lunette he needs it is possible they sourced them from other foundries...while it is more LIKELY that a Bantam owner would seek a PSC BU42 or BU43, there is nothing here to tell us what they used in 1944 or 1945....

Then there are lunettes with NO markings on them as well!

Good luck fellas!
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Re: Information: Visual Differences - A-6370 & PSC BU43 Lune

Post by Chance » Mon Feb 06, 2017 9:55 am

Great info Chuck!

I noticed the threaded ends one is filled in and the other not

The one here seems to be a 3B as you reference.

Still can't track down the foundry mark on the WO lunette


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Re: Information: Visual Differences - A-6370 & PSC BU43 Lune

Post by Chuck Lutz » Mon Feb 06, 2017 10:20 am

Willys would probably have contracted for that and many parts that were forged or cast from companies within a 200 mile radius...the same vendors they probably used to make the Americar. If you had a search engine that would seek only companies that did casting and forging in 1941 within that distance you might find it. Also a search of logos/mfgers marks from the 1930s may prove fruitful.
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Re: Information: Visual Differences - A-6370 & PSC BU43 Lune

Post by Joe Friday » Mon Feb 06, 2017 11:14 am

Willys has the 5/16 60 degree hole in the end...
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Re: Information: Visual Differences - A-6370 & PSC BU43 Lune

Post by Joe Gopan » Mon Feb 06, 2017 1:43 pm

Tapered holes either end are to center the unfinished Lunette for machining and grinding the two seats and for the threading operation...
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Re: Information: Visual Differences - A-6370 & PSC BU43 Lunettes

Post by Chance » Mon Aug 21, 2017 11:28 am

With regard to "PSC" marking:

I just recently discovered a reference to:

http://www.theshermantank.com/sherman/s ... ve-anyway/

Perhaps PSC stands for Pressed Steel Car a company that apparently manufactured Shermans during the war.

As far as the A-6370 stamped lunette, Ray contributed that the marking looks very much like those found on Dodge Weapon Carrier bolt heads.

viewtopic.php?f=141&t=282888&p=1678454#p1678454
Chance
1943 - January | Willys MB "Skimpy" | Frame No. #203301
1943 - January | Willys MB-T | Serial No. 21488


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