Use View Original mode. Here is a range of California CD's in its distinctive blue glass. The CD 161 near the center is unusually rich and dark for a blue. This color represents the earliest production color for California glass insulators when the batch sand came from Horseshoe Bend in Orange County.
Looking for the California CD 133 in blue and there should be a CD 201 and CD 260 (pinch ear) in blue as well but that color/CD combination has not been reported yet.