Only one style of the CD 104 NEW ENG.TEL.& TEL.CO (New England Telephone & Telegraph Company) is Hemingray made. That is the  embossing. There are some units out there that are very close looking to Hemingray ones but are not. Vast majority of CD 104s are NOT Hemingray made. There are some common Hemingray characteristics that will get you on the right track to identifying Hemingray made CD 104’s. Remember, there are some that have most of those characteristics but are not Hemingray!
As with all Hemingray insulators, they will never have a MLOD (Mold Line Over Dome) Hemingray used 3 piece molds. If the Insulator has a MLOD you can quickly eliminate it as being Hemingray.
The Hemingray ones do NOT have dome numbers or a glass dot.
Sharp mold lines on the dome, similar to what you see on a CD 112.4 Hemingray No 8. This also is a common characteristic of other Hemingray made insulators.
The Hemingray made units have a tighter arc than MOST (but not all) of the CD 104’s. Some NON Hemingray ones have the same arc pattern so this step must be combined with the others in determining if the CD 104 is a Hemingray or not. The NON Hemingray examples below are of some the tighter arc ones that are close. One Hemingray example I measured has a width of 1.748” or 44.41mm from the tip of the first N to top of L. Thats not to say others are the same (there are at least 2 Hemingray molds) or non Hemingray ones won’t be close, just a interesting data point. At this point there are so few confirmed Hemingray units that more data needs to be collected.
Thin Crisp embossing. Same kind of embossing that you see on most Hemingray insulators. Also the “&” is a good indicator of a Hemingray made one. Also the Shape of the “O” in CO. The “N” on the Hemingray made ones is unique.
On all the Hemingray made units the arc embossing and the CO. are about level. Some of the NON Hemingray ones have the CO up higher. There are NON Hemingray ones that have the arc and CO aligned.
Be sure to check out the “Collections : CD 104 NEW ENG.TEL.& TEL.CO” page to see photos of Hemingray made examples!
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