"WH" Ghost Image in18 Automatic D-160, D-180, D-200 Battery Box

["D"- Man 827]

Has anyone ever noticed the WH ghost image in the battery box {Part # 102179} on an 18 Automatic D-160, D-180, D-200?  I realize that not many of the original battery boxes are still with the tractors, especially after about 30-40 years, but; I have two, and in one of them when you hold it up to the light you can see the capitol letters W H.  These can be seen in the upper right corner of the battery box.  

[AMC RULES 37,127]

[19richie66 17,499]

No but if I hold mine up to the light I can see the light, lol. Think mine is too far gone.

[prondzy 3,881]

Is it a metal or plastic box?

["D"- Man 827]

Pictures do not show it very well, it's best to just hold one up to the light, however; since you asked I'll post an image of one I took.  This is the upper right corner of the top {inside} of the battery box. 

 

Is it a metal or plastic box?

Mine are plastic.