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Dating the US M1

A basic guide

 

DatingM1-1.jpg

 

The US M1 has been in service since early '40s to early '80s so what distinctive features can tell us wether we have a wartime helmet or  a postwar one?

 

Let's start with some basic rules:

 - The shell -

1) all the shells with fixed bails to hold the chinstrap have been produced during WW2, from April 1941 to October 1943, then started the production of swivel bails. In both cases the straps are stitched to the loops. The use of clasps is postwar.

FB.JPG SB.JPG

Below: postwar clasps to attach the straps to the loops.
T-Clasp1.jpg T-Clasp2.jpg

2) all shells with the rim that has the seam in front have been produced during WW2, from April 1941 to November 1944, either fixed or swivel bails. Then the seam moved to the rear until August 1945 when production ceased.

FrontRear.jpg

 

3) the production of M1 shells started over in 1951, so how can we recognize a late war from a postwar? Under the brim there is a number indicating the production lot. If this number is between 0 and 1300 then we have a WW2 era shell. This is true for McCord Radiator manufactured shells, however all Schlueter shells have been produced during WW2.

Hs164A.jpg Hs566a.jpg
Hs785c.jpg HS1260E.JPG

4) and last, also the color, the texturization and the shape of the shell indicate its age. Wartime shells are a little taller, in a darker shade of green. In postwar helmets sand is used to texturize the surface instead of cork.  

Colors.jpg

A distinctive characteristic of early war examples, due to the type of steel used, is that they were prone to generate stress cracks on the shell. Also they were fitted with a rim that lost the paint showing the brightness of the stainless steel it was made of.

StressCrack1.JPG StressCrack2.JPG
 

- The straps & the buckle -

Since the production began, until 1943 the colour of the straps attached to the shell was the olive drab #3, from 1943, mostly on Schlueters, the shells started to be fitted with straps colour olive drab #7. However straps OD#3 can be found in rear seam late war examples too. Postwar helmets have attached straps colour OD#7.

Early war examples had a raised bar brass buckle. Mid war helmets were fitted with blackend steel buckle with simplified design. Late war helmets have a blackened brass buckle with simplified design. Since September 1944 a new release hook, called T1 was adopted and seldomly mounted, though it became a standard only on years '50s production.

Chinstrap1.JPG Chinstrap2.JPG
Chinstrap3.JPG Chinstrap4.JPG

- Field and postwar repaint-

Most of US M1 in use during the Korean War up to early Vietnam War were produced during WW2 and then repainted, fitted with new straps and new liner. It is not easy to tell if the repainting of a shell dates back to WW2 or later, other clues can help like the stitching on the straps and the liner.

See below some examples of repainted helmets, they may be either WW2 field repaint or postwar refurbishment of original WW2 shells.

RepA1.JPG RepA2.JPG
RepB1.JPG RepB2.JPG
RepC1.JPG RepC2.JPG

In particular Navy helmets used to see many layers of paint during their life 

USM1NavyFBa.JPG USM1NavyFBd.JPG

- The liner -

According to what we said above the US M1 may result in a mixture of components added or replaced in different years. This is true for the liner as well. We can just identify some criteria to distinguish a wartime liner from a postwar one.

First of all the producers: Low pressure liner Saint Clair and Hood Rubber, fibres liner Hawley and General Fibres, high pressure liner Inland, International Molded Plastic, Seaman Paper co. and Firestone ceased the production before or at the end of the war. All other high pressure liner: Westinghouse, MSA and Capac were produced after 1950 too.

Hawley1.jpg Hawley2.jpg

Above: the pressed cardboard Hawley liner, produced from June 1941 to November 1942.

HR1.jpg HR2.jpg

Above: the low pressure Hood Rubber liner; below: the distinctive shape of the low pressure Saint Clair liner. Both were produced from April 1942 to November 1943

SC1.JPG SC2.JPG

Below: the use of decals is more common postwar, decals like this are commonly found on years '50s liners. 

USM1KNj.JPG USM1KNk.JPG

The straps and the A washers: during the war the straps of the lining system were in tan colour OD#3 whilst postwar liner had green OD#7 straps.

IntWW2.jpg IntPost.jpg

 Below: on the left a early war alu unpainted A-washer; on the right a green coated mid-war A-washer

Awash1.jpg Awash2.jpg

Awash3.jpg Awash4.jpg

Above: on the left a late war black coated A-washer; on the right a postwar black coated A-washer on a OD#3 green strap

 

The leather chinstrap: another component that can help to date a liner is the leather chinstrap. All postwar chinstraps are made of blackened steel, are marked DOT on the rivets and usually bear a anchor under the flip tab of the buckle.

Awash3.jpg Awash3.jpg

 Below you see an early fix type chinstrap; a midwar green hardware chinstrap marked "United Carr" and a late war (1944) brass buckle with patent number "United Carr" chinstrap.

Awash3.jpg Awash3.jpg
Awash3.jpg Awash3.jpg
Awash3.jpg Awash3.jpg

Now you should be able to understand at a glance what kind of helmet you are observing, at least if it is a WW2 era M1 or later. Try looking at the pics underneath and guess what it is:

Tutorial1.jpg
Tutorial1.jpg

I hope you liked this tutorial, if you want to add something to it or even if you want to write your own tutorial on a different subject please contact me: jaberon@fastwebnet.it.