Not sure, but I have a Lufkin no 7122 marked on the back:

N.Y.C & PENNA.
SERIAL NO. E2
APPROVED TYPE

I asked about it a few months ago and no one knew.  I thought it was
railroad related, but I guess there never was a NYC and Penn railroad.

Dave Sawyer
Evansville, IN

From: "Minch" 

> GG
>
> I picked up a Stanley Sweetheart #41 yardstick this morning and it has
some
> language on it that I don't understand.
>
> It is marked in inches on the front and on the back as 1/32, 1/16, 1/8,
1/4,
> 3/8, 1/2, and  3/4 YD.
>
> Also on the back in small capitol letters is:
>
> SERIA LF.2
> APP.TYPE351
> N.Y.C.PA.ALA.
>
> What means this??
>