I thought it might be interesting to compare the two CD 729 insulators which were found on the Northern Central Railroad in the New Freedom, PA area. These two insulators include:

CD-729 No Embossing - MLOD / Button Mold - Blue Aqua (Crude with milk & bubbles) - Measurements: 75 mm Wide x 97 mm High.

CD-729 No Embossing - MLOD / Button Mold - Deep Orange Amber - Measurements: 75 mm Wide x 97 mm High.