I have some brochure with the logo 1957 but they're older ...On a book Caterpillar and on Internet it's well written 1957/ 1967 ?
 

gauntjoh wrote:

Bonjour Bruno,
If you are able to scan the brochures and email the pdf files to This email address is being protected from spambots. You need JavaScript enabled to view it. I will load them into the members library.
Thanks for posting.

Bonjour John,
Unfortunately it's not possible for me to scan the brochure I have only my Iphone.
Sorry
 

D9D 1955

You are correct that the bold lettered logo is credited as being introduced in 1957, even in some history books put out by Cat, but it was, in fact, introduced in 1955. The D9 used the post-1955 logo from the start. Interestingly, there is a Cat drawing for a D9 decal in the " = D9 =" style used through 1954, but I have never seen a picture where it was used.

DavidTallon wrote:

You are correct that the bold lettered logo is credited as being introduced in 1957, even in some history books put out by Cat, but it was, in fact, introduced in 1955. The D9 used the post-1955 logo from the start. Interestingly, there is a Cat drawing for a D9 decal in the " = D9 =" style used through 1954, but I have never seen a picture where it was used.

Thank you David , yes it's very rare but probably possible . I found this pictures but without =D9=

I don't have a good answer for you on the font for the S/N tags.  The drawings only specify a height of 1/4", they don't stipulate the font used.  I suspect it was just based on the stamp set they had and/or the vendor they used.  

There are two different letter styles used for the 5U s/n tags.  Early ones are a more stylized font, and later are more plain.  It is curious that the later style appears identical to the style used prior to the "stylized" ones.  See the attached 5J, early 5U, and later 5U tags.  Quickly looking through photos, it seems possible that they switched vendors when they switched from the brass version of 1B-1925 to the aluminum version, and then switched back when they changed to the 1H-1072 tag.