If you couldn't pick the poles yourself or get first hand accounts from the lineman who maintained or wreaked out the line, then I have always felt that buying a lineman's insulator collection was the next best thing to understand the insulator geography of an area. As housing is still relatively inexpensive in this part of the Central Valley, I am going to assume this telephone lineman was able to live and work in the same geographic area -- Bakersfield, CA
Here are my finds. About the same quantity was acquired by a married couple of insulator collectors who purchased mainly dark purple California CD 161's and CD 162's and purple Whittal Tatum No. 1's.
Bottom row: Purple Whittal Tatum No. 1's with all different mold nos. Lots of these were in the collection. Next row up: Amber swirled aqua No. 20 CD 133; a trio of light aqua H.G.CO. CD 151 's, one has some nice amber swirls. Next row up: a Brookfield CD 164 in dark aqua with an odd inclusion best described as a medium size stony tadpole; McLaughlin-20 in emerald green; Maydwell-20 in white milkglass; PT mold C.G.I.Co. pony CD 102 in smokey purple and a RT mold C.G.I.Co. pony CD 102 in aqua. Inquiries welcomed. Next photo [id=470325709]