| Lapp |
| Lapp Insulator Company Inc. was founded in 1916 in LeRoy, N.Y. and continues to manufacture insulators to the present (post type). |
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| 2nd quarter of 1924 |
| 1st quarter of 1922 |
| 3rd quarter of 1924 |
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| Characteristics: Color(s) --- dark blue, cobalt blue, sky blue, white, a distinctive pumpkin brown, reddish brown, light brown (nearly a butterscotch tone) Pinhole(s) --- glazed Pinhole Top(s) --- older (incised) are plain, newer (ink) are flat penny sized indentation Fire Rested --- petticoat Wet/Dry Processed --- wet Marking(s) --- incised Lapp symbol on skirt. Ink stamped symbol, date, name on skirt |
| All above and below are U 299's |
| U 309A |
| U 299's |
| U 299's |
| U 299's |
| U 299 |