The Ford Barn

dorvedahl47pu · 12-26-2020, 11:55 PM

Good evening,

Does anyone know how to interpret the codes stamped on the back of a speedometer housing? These are the numbers I have. All Stewart Warner 1940s.

569F
579X
579P Q9
579R H4

In a nutshell, does 569 decode as something different than 579?
Are the 4th digit alpha characters significant?
What about the Q9 and H4?

Thanks.

19Fordy · 12-27-2020, 08:48 AM

Might be inspector test stamps.

dorvedahl47pu · 12-27-2020, 11:59 AM

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Thank you Sir.

12-26-2020, 11:55 PM	#1
dorvedahl47pu Member Join Date: Sep 2020 Location: Hooper, Utah Posts: 79	Speedometer Question Good evening, Does anyone know how to interpret the codes stamped on the back of a speedometer housing? These are the numbers I have. All Stewart Warner 1940s. 569F 579X 579P Q9 579R H4 In a nutshell, does 569 decode as something different than 579? Are the 4th digit alpha characters significant? What about the Q9 and H4? Thanks.

12-27-2020, 08:48 AM	#2
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,950	Re: Speedometer Question Might be inspector test stamps.

12-27-2020, 11:59 AM	#3
dorvedahl47pu Member Join Date: Sep 2020 Location: Hooper, Utah Posts: 79	Re: Speedometer Question Sponsored Links (Register now to hide all advertisements) Thank you Sir.